diff --git a/progress.txt b/progress.txt
index e946da2..a0d68f4 100644
--- a/progress.txt
+++ b/progress.txt
@@ -1,4 +1,4 @@
-[更新时间] 2026-02-13
+[更新时间] 2026-02-13（第二次更新）
 [项目] 星程桑基图
 
 一、已完成（Done）
@@ -14,6 +14,8 @@
 6. 已实现默认样例加载：页面首次进入自动读取 `data/example0.xlsx`。
 7. 已有核心单测（parser + sankey 聚合 + xlsx 读取）。
 8. 小程序端已完成视觉骨架（非完整业务）。
+9. 已实现本地持久化：用户上传文件、映射配置与预览选项会写入 localStorage，刷新后自动恢复。
+10. 已新增“汇聚对齐”配置（Between/Middle/Top/Bottom），可控制 target 侧对齐，且 gap 作为源侧基准。
 
 二、当前状态（In Progress）
 1. 无进行中的代码重构任务。
@@ -26,7 +28,7 @@
    - IMPLEMENTATION_PLAN.md
 
 三、已知问题 / 风险（Known Issues）
-1. 当前无后端、无持久化，刷新页面后状态丢失（符合当前范围）。
+1. 本地持久化基于 localStorage，受浏览器容量限制；超大文件可能无法完整保存。
 2. Vite 开发配置依赖本机 HTTPS 证书路径，换机器可能无法直接启动。
 3. 当前“目标数据”无独立数值列，数值始终来自 source data 列；若未来业务需要需先改 PRD。
 4. 小程序仅骨架，尚未接入真实解析、渲染与导出。
diff --git a/src/App.vue b/src/App.vue
index 552be6b..dbebda7 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -260,6 +260,18 @@
                 </option>
               </select>
             </label>
+            <label class="target-align-control">
+              <span class="target-align-label">汇聚对齐</span>
+              <select v-model="targetAlignMode" class="target-align-select">
+                <option
+                  v-for="option in targetAlignOptions"
+                  :key="option.value"
+                  :value="option.value"
+                >
+                  {{ option.label }}
+                </option>
+              </select>
+            </label>
           </div>
         </div>
 
@@ -301,7 +313,7 @@ import { CanvasRenderer, SVGRenderer } from 'echarts/renderers';
 import {
   applyDirection,
   buildSankeyData,
-  parseDataFile,
+  parseCsvText,
   parseXlsxBuffer,
   type MappingConfig,
   type RawTable,
@@ -328,6 +340,34 @@ import iconPadding from '../assets/icons/padding.svg';
 
 echarts.use([SankeyChart, TooltipComponent, CanvasRenderer, SVGRenderer]);
 
+const WORKSPACE_STORAGE_KEY = 'sankey-workspace-v1';
+const WORKSPACE_STORAGE_VERSION = 1;
+type LabelPositionMode = 'inner' | 'outer' | 'left' | 'right';
+type TargetAlignMode = 'between' | 'middle' | 'top' | 'bottom';
+
+interface PersistedUploadedFile {
+  name: string;
+  type: string;
+  base64: string;
+}
+
+interface PersistedWorkspace {
+  version: number;
+  uploadedFile?: PersistedUploadedFile;
+  mapping?: MappingConfig;
+  direction?: 'source-to-target' | 'target-to-source';
+  nodeGap?: number;
+  chartPadding?: number;
+  selectedThemeId?: string;
+  labelPositionMode?: LabelPositionMode;
+  targetAlignMode?: TargetAlignMode;
+  sectionVisible?: Partial<{
+    sourceData: boolean;
+    sourceDesc: boolean;
+    targetDesc: boolean;
+  }>;
+}
+
 const themes = THEME_PRESETS;
 const selectedThemeId = ref<string>('figma-violet');
 const showThemePicker = ref(false);
@@ -336,6 +376,7 @@ const parseError = ref('');
 const buildError = ref('');
 
 const chartRef = ref<HTMLDivElement | null>(null);
+const chartClientHeight = ref(0);
 const fileInputRef = ref<HTMLInputElement | null>(null);
 const themeWheelRef = ref<HTMLDivElement | null>(null);
 const themeTriggerRef = ref<HTMLDivElement | null>(null);
@@ -348,6 +389,8 @@ const THEME_ROW_HEIGHT = 42;
 
 const rawTable = ref<RawTable | null>(null);
 const buildResult = ref<SankeyBuildResult | null>(null);
+const uploadedFileSnapshot = ref<PersistedUploadedFile | null>(null);
+const isRestoringWorkspace = ref(false);
 
 const mapping = reactive<MappingConfig>({
   sourceDataColumn: 2,
@@ -359,7 +402,6 @@ const mapping = reactive<MappingConfig>({
 const direction = ref<'source-to-target' | 'target-to-source'>('source-to-target');
 const nodeGap = ref(5);
 const chartPadding = ref(24);
-type LabelPositionMode = 'inner' | 'outer' | 'left' | 'right';
 const labelPositionMode = ref<LabelPositionMode>('inner');
 const labelPositionOptions: Array<{ value: LabelPositionMode; label: string }> = [
   { value: 'inner', label: '向内' },
@@ -367,6 +409,13 @@ const labelPositionOptions: Array<{ value: LabelPositionMode; label: string }> =
   { value: 'left', label: '向左' },
   { value: 'right', label: '向右' }
 ];
+const targetAlignMode = ref<TargetAlignMode>('between');
+const targetAlignOptions: Array<{ value: TargetAlignMode; label: string }> = [
+  { value: 'between', label: 'Between' },
+  { value: 'middle', label: 'Middle' },
+  { value: 'top', label: 'Top' },
+  { value: 'bottom', label: 'Bottom' }
+];
 /**
  * 左侧字段区块的展开/折叠状态。
  * true 表示展开，false 表示折叠。
@@ -426,11 +475,103 @@ function resolveEdgeLabelPosition(
   return isLeftEdge ? 'left' : 'right';
 }
 
+/**
+ * 计算 target 侧节点 localY（0~1）。
+ * - gap 滑块只作为源侧基准
+ * - target 侧通过“汇聚对齐”决定布局
+ */
+function buildTargetLocalYMap(
+  links: Array<{ source: string; target: string; value: number }>
+): Map<string, number> {
+  const map = new Map<string, number>();
+  const layoutHeight = Math.max(0, chartClientHeight.value - chartPadding.value * 2);
+  if (layoutHeight <= 0 || links.length === 0) {
+    return map;
+  }
+
+  const incomingCountMap = new Map<string, number>();
+  const outgoingCountMap = new Map<string, number>();
+  const sourceValueMap = new Map<string, number>();
+  const targetValueMap = new Map<string, number>();
+  const appearanceOrder: string[] = [];
+  const seen = new Set<string>();
+
+  links.forEach((link) => {
+    outgoingCountMap.set(link.source, (outgoingCountMap.get(link.source) ?? 0) + 1);
+    incomingCountMap.set(link.target, (incomingCountMap.get(link.target) ?? 0) + 1);
+    sourceValueMap.set(link.source, (sourceValueMap.get(link.source) ?? 0) + link.value);
+    targetValueMap.set(link.target, (targetValueMap.get(link.target) ?? 0) + link.value);
+
+    if (!seen.has(link.source)) {
+      seen.add(link.source);
+      appearanceOrder.push(link.source);
+    }
+    if (!seen.has(link.target)) {
+      seen.add(link.target);
+      appearanceOrder.push(link.target);
+    }
+  });
+
+  const sourceNames = appearanceOrder.filter((name) => {
+    const incoming = incomingCountMap.get(name) ?? 0;
+    const outgoing = outgoingCountMap.get(name) ?? 0;
+    return incoming === 0 && outgoing > 0;
+  });
+  const targetNames = appearanceOrder.filter((name) => {
+    const incoming = incomingCountMap.get(name) ?? 0;
+    const outgoing = outgoingCountMap.get(name) ?? 0;
+    return outgoing === 0 && incoming > 0;
+  });
+
+  if (sourceNames.length === 0 || targetNames.length === 0) {
+    return map;
+  }
+
+  const totalValue = sourceNames.reduce((sum, name) => sum + (sourceValueMap.get(name) ?? 0), 0);
+  if (totalValue <= 0) {
+    return map;
+  }
+
+  const sourceGap = Math.max(0, nodeGap.value);
+  const sourceGapCount = Math.max(0, sourceNames.length - 1);
+  const sourceContentHeight = Math.max(0, layoutHeight - sourceGap * sourceGapCount);
+  const unitHeight = totalValue > 0 ? sourceContentHeight / totalValue : 0;
+  const totalNodeHeight = totalValue * unitHeight;
+  const sourceSpanHeight = totalNodeHeight + sourceGap * sourceGapCount;
+
+  let targetGap = sourceGap;
+  if (targetAlignMode.value === 'between' && targetNames.length > 1) {
+    targetGap = (sourceSpanHeight - totalNodeHeight) / (targetNames.length - 1);
+  }
+  targetGap = Math.max(0, targetGap);
+
+  const targetSpanHeight = totalNodeHeight + targetGap * Math.max(0, targetNames.length - 1);
+  let targetStartY = 0;
+  if (targetAlignMode.value === 'middle') {
+    targetStartY = (sourceSpanHeight - targetSpanHeight) / 2;
+  } else if (targetAlignMode.value === 'bottom') {
+    targetStartY = sourceSpanHeight - targetSpanHeight;
+  }
+  targetStartY = Math.max(0, targetStartY);
+
+  let cursorY = targetStartY;
+  targetNames.forEach((name, index) => {
+    map.set(name, cursorY / layoutHeight);
+    cursorY += (targetValueMap.get(name) ?? 0) * unitHeight;
+    if (index < targetNames.length - 1) {
+      cursorY += targetGap;
+    }
+  });
+
+  return map;
+}
+
 const chartNodes = computed(() => {
   const links = chartLinks.value;
   const names = new Set<string>();
   const incomingCountMap = new Map<string, number>();
   const outgoingCountMap = new Map<string, number>();
+  const targetLocalYMap = buildTargetLocalYMap(links);
 
   links.forEach((link) => {
     names.add(link.source);
@@ -450,6 +591,7 @@ const chartNodes = computed(() => {
       itemStyle: {
         color: palette[index % palette.length]
       },
+      localY: targetLocalYMap.get(name),
       label: position
         ? {
             position
@@ -548,7 +690,34 @@ watch(
   { deep: true }
 );
 
+watch(
+  () => [
+    mapping.sourceDataColumn,
+    mapping.sourceDescriptionColumns.join(','),
+    mapping.targetDescriptionColumns.join(','),
+    mapping.delimiter,
+    direction.value,
+    nodeGap.value,
+    chartPadding.value,
+    selectedThemeId.value,
+    labelPositionMode.value,
+    targetAlignMode.value,
+    sectionVisible.sourceData,
+    sectionVisible.sourceDesc,
+    sectionVisible.targetDesc,
+    uploadedFileSnapshot.value?.name ?? '',
+    uploadedFileSnapshot.value?.base64.length ?? 0
+  ],
+  () => {
+    if (isRestoringWorkspace.value) {
+      return;
+    }
+    persistWorkspace();
+  }
+);
+
 function syncChartSize(): void {
+  chartClientHeight.value = chartRef.value?.clientHeight ?? chartClientHeight.value;
   chartInstance?.resize();
 }
 
@@ -788,6 +957,262 @@ function setDefaultMappingByHeaders(headers: string[]): void {
   );
 }
 
+/**
+ * 将映射配置整体应用到响应式对象，避免散落赋值导致状态不一致。
+ */
+function applyMappingConfig(next: MappingConfig): void {
+  mapping.sourceDataColumn = next.sourceDataColumn;
+  mapping.sourceDescriptionColumns = [...next.sourceDescriptionColumns];
+  mapping.targetDescriptionColumns = [...next.targetDescriptionColumns];
+  mapping.delimiter = next.delimiter;
+}
+
+/**
+ * 根据文件名解析上传内容，统一返回 RawTable。
+ */
+function parseTableByFileName(fileName: string, buffer: ArrayBuffer): RawTable {
+  const lowerName = fileName.toLowerCase();
+  if (lowerName.endsWith('.csv')) {
+    const csvText = new TextDecoder().decode(buffer);
+    return parseCsvText(csvText);
+  }
+
+  if (lowerName.endsWith('.xlsx') || lowerName.endsWith('.xls')) {
+    return parseXlsxBuffer(buffer);
+  }
+
+  throw new Error('仅支持 .csv / .xlsx / .xls 文件');
+}
+
+/**
+ * 将 ArrayBuffer 编码为 Base64，便于写入 localStorage。
+ */
+function arrayBufferToBase64(buffer: ArrayBuffer): string {
+  const bytes = new Uint8Array(buffer);
+  const chunkSize = 0x8000;
+  let binary = '';
+
+  for (let index = 0; index < bytes.length; index += chunkSize) {
+    const chunk = bytes.subarray(index, index + chunkSize);
+    binary += String.fromCharCode(...chunk);
+  }
+
+  return btoa(binary);
+}
+
+/**
+ * 将 Base64 解码回 ArrayBuffer。
+ */
+function base64ToArrayBuffer(base64: string): ArrayBuffer {
+  const binary = atob(base64);
+  const bytes = new Uint8Array(binary.length);
+
+  for (let index = 0; index < binary.length; index += 1) {
+    bytes[index] = binary.charCodeAt(index);
+  }
+
+  return bytes.buffer;
+}
+
+/**
+ * 将上传文件快照化，写入持久层用于刷新后恢复。
+ */
+function createUploadedFileSnapshot(
+  fileName: string,
+  fileType: string,
+  fileBuffer: ArrayBuffer
+): PersistedUploadedFile {
+  return {
+    name: fileName,
+    type: fileType,
+    base64: arrayBufferToBase64(fileBuffer)
+  };
+}
+
+/**
+ * 对持久层中的 mapping 做安全化处理，避免列越界导致恢复失败。
+ */
+function sanitizePersistedMapping(
+  persistedMapping: MappingConfig | undefined,
+  columnSize: number
+): MappingConfig {
+  const safeSize = Math.max(columnSize, 1);
+  const safeColumn = (index: number): number => Math.min(Math.max(index, 0), safeSize - 1);
+  const normalizeColumns = (columns: unknown): number[] => {
+    if (!Array.isArray(columns)) {
+      return [];
+    }
+
+    return columns
+      .filter((item): item is number => Number.isInteger(item))
+      .map((item) => safeColumn(item))
+      .filter((item, index, list) => list.indexOf(item) === index)
+      .sort((a, b) => a - b);
+  };
+
+  const defaultMapping: MappingConfig = {
+    sourceDataColumn: safeColumn(2),
+    sourceDescriptionColumns: [safeColumn(0)].filter(
+      (item, index, list) => list.indexOf(item) === index
+    ),
+    targetDescriptionColumns: [safeColumn(2)].filter(
+      (item, index, list) => list.indexOf(item) === index
+    ),
+    delimiter: '-'
+  };
+
+  if (!persistedMapping) {
+    return defaultMapping;
+  }
+
+  const sourceDataColumn =
+    typeof persistedMapping.sourceDataColumn === 'number' && Number.isInteger(persistedMapping.sourceDataColumn)
+      ? safeColumn(persistedMapping.sourceDataColumn)
+      : defaultMapping.sourceDataColumn;
+  const sourceDescriptionColumns = normalizeColumns(persistedMapping.sourceDescriptionColumns);
+  const targetDescriptionColumns = normalizeColumns(persistedMapping.targetDescriptionColumns);
+
+  return {
+    sourceDataColumn,
+    sourceDescriptionColumns,
+    targetDescriptionColumns:
+      targetDescriptionColumns.length > 0 ? targetDescriptionColumns : defaultMapping.targetDescriptionColumns,
+    delimiter:
+      typeof persistedMapping.delimiter === 'string' && persistedMapping.delimiter.length > 0
+        ? persistedMapping.delimiter
+        : '-'
+  };
+}
+
+/**
+ * 保存当前工作区（文件 + 映射 + 控件状态），用于刷新后恢复。
+ */
+function persistWorkspace(): void {
+  if (typeof window === 'undefined') {
+    return;
+  }
+
+  const workspace: PersistedWorkspace = {
+    version: WORKSPACE_STORAGE_VERSION,
+    uploadedFile: uploadedFileSnapshot.value ?? undefined,
+    mapping: {
+      sourceDataColumn: mapping.sourceDataColumn,
+      sourceDescriptionColumns: [...mapping.sourceDescriptionColumns],
+      targetDescriptionColumns: [...mapping.targetDescriptionColumns],
+      delimiter: mapping.delimiter
+    },
+    direction: direction.value,
+    nodeGap: nodeGap.value,
+    chartPadding: chartPadding.value,
+    selectedThemeId: selectedThemeId.value,
+    labelPositionMode: labelPositionMode.value,
+    targetAlignMode: targetAlignMode.value,
+    sectionVisible: {
+      sourceData: sectionVisible.sourceData,
+      sourceDesc: sectionVisible.sourceDesc,
+      targetDesc: sectionVisible.targetDesc
+    }
+  };
+
+  try {
+    window.localStorage.setItem(WORKSPACE_STORAGE_KEY, JSON.stringify(workspace));
+  } catch (error) {
+    // localStorage 可能因为容量上限失败，记录日志便于排查，但不阻断主流程。
+    console.warn('工作区保存失败:', error);
+  }
+}
+
+/**
+ * 从持久层恢复工作区。
+ * 返回值表示是否恢复了“用户上传文件”。
+ */
+async function restoreWorkspaceFromStorage(): Promise<{
+  restoredUploadedFile: boolean;
+  restoredMapping?: MappingConfig;
+}> {
+  if (typeof window === 'undefined') {
+    return { restoredUploadedFile: false };
+  }
+
+  const rawWorkspace = window.localStorage.getItem(WORKSPACE_STORAGE_KEY);
+  if (!rawWorkspace) {
+    return { restoredUploadedFile: false };
+  }
+
+  isRestoringWorkspace.value = true;
+  try {
+    const workspace = JSON.parse(rawWorkspace) as PersistedWorkspace;
+    if (workspace.version !== WORKSPACE_STORAGE_VERSION) {
+      return { restoredUploadedFile: false };
+    }
+
+    if (workspace.direction === 'source-to-target' || workspace.direction === 'target-to-source') {
+      direction.value = workspace.direction;
+    }
+
+    if (typeof workspace.nodeGap === 'number' && Number.isFinite(workspace.nodeGap)) {
+      nodeGap.value = Math.max(0, Math.min(30, workspace.nodeGap));
+    }
+
+    if (typeof workspace.chartPadding === 'number' && Number.isFinite(workspace.chartPadding)) {
+      chartPadding.value = Math.max(0, Math.min(80, workspace.chartPadding));
+    }
+
+    if (typeof workspace.selectedThemeId === 'string' && themes.some((item) => item.id === workspace.selectedThemeId)) {
+      selectedThemeId.value = workspace.selectedThemeId;
+    }
+
+    if (
+      workspace.labelPositionMode === 'inner' ||
+      workspace.labelPositionMode === 'outer' ||
+      workspace.labelPositionMode === 'left' ||
+      workspace.labelPositionMode === 'right'
+    ) {
+      labelPositionMode.value = workspace.labelPositionMode;
+    }
+
+    if (
+      workspace.targetAlignMode === 'between' ||
+      workspace.targetAlignMode === 'middle' ||
+      workspace.targetAlignMode === 'top' ||
+      workspace.targetAlignMode === 'bottom'
+    ) {
+      targetAlignMode.value = workspace.targetAlignMode;
+    }
+
+    if (workspace.sectionVisible) {
+      if (typeof workspace.sectionVisible.sourceData === 'boolean') {
+        sectionVisible.sourceData = workspace.sectionVisible.sourceData;
+      }
+      if (typeof workspace.sectionVisible.sourceDesc === 'boolean') {
+        sectionVisible.sourceDesc = workspace.sectionVisible.sourceDesc;
+      }
+      if (typeof workspace.sectionVisible.targetDesc === 'boolean') {
+        sectionVisible.targetDesc = workspace.sectionVisible.targetDesc;
+      }
+    }
+
+    if (!workspace.uploadedFile) {
+      return { restoredUploadedFile: false, restoredMapping: workspace.mapping };
+    }
+
+    const fileBuffer = base64ToArrayBuffer(workspace.uploadedFile.base64);
+    const parsed = parseTableByFileName(workspace.uploadedFile.name, fileBuffer);
+    rawTable.value = parsed;
+    uploadedFileSnapshot.value = workspace.uploadedFile;
+    applyMappingConfig(sanitizePersistedMapping(workspace.mapping, parsed.headers.length));
+    uploadMessage.value = `已恢复: ${workspace.uploadedFile.name}（${parsed.rows.length} 行）`;
+    parseError.value = '';
+    return { restoredUploadedFile: true };
+  } catch (error) {
+    window.localStorage.removeItem(WORKSPACE_STORAGE_KEY);
+    console.warn('工作区恢复失败，已清理坏数据:', error);
+    return { restoredUploadedFile: false };
+  } finally {
+    isRestoringWorkspace.value = false;
+  }
+}
+
 /**
  * 统一处理上传文件，支持点击上传和拖拽上传两种入口。
  */
@@ -795,10 +1220,13 @@ async function loadDataFile(file: File): Promise<void> {
   parseError.value = '';
 
   try {
-    const parsed = await parseDataFile(file);
+    const fileBuffer = await file.arrayBuffer();
+    const parsed = parseTableByFileName(file.name, fileBuffer);
     rawTable.value = parsed;
     setDefaultMappingByHeaders(parsed.headers);
+    uploadedFileSnapshot.value = createUploadedFileSnapshot(file.name, file.type, fileBuffer);
     uploadMessage.value = `已加载: ${file.name}（${parsed.rows.length} 行）`;
+    persistWorkspace();
   } catch (error) {
     parseError.value = error instanceof Error ? error.message : '文件解析失败';
   }
@@ -842,6 +1270,7 @@ async function loadDefaultExampleFile(): Promise<void> {
     const parsed = parseXlsxBuffer(buffer);
     rawTable.value = parsed;
     setDefaultMappingByHeaders(parsed.headers);
+    uploadedFileSnapshot.value = null;
     uploadMessage.value = `已加载: example0.xlsx（${parsed.rows.length} 行）`;
     parseError.value = '';
   } catch (error) {
@@ -920,8 +1349,19 @@ onMounted(() => {
   }
 
   chartInstance = echarts.init(container, undefined, { renderer: 'canvas' });
+  chartClientHeight.value = container.clientHeight;
   chartInstance.setOption(chartOption.value);
-  void loadDefaultExampleFile();
+  void (async () => {
+    const { restoredUploadedFile, restoredMapping } = await restoreWorkspaceFromStorage();
+    if (restoredUploadedFile) {
+      return;
+    }
+
+    await loadDefaultExampleFile();
+    if (restoredMapping && rawTable.value) {
+      applyMappingConfig(sanitizePersistedMapping(restoredMapping, rawTable.value.headers.length));
+    }
+  })();
   window.addEventListener('resize', syncChartSize);
   window.addEventListener('resize', updateThemePopoverPosition);
   window.addEventListener('scroll', updateThemePopoverPosition, true);
diff --git a/src/styles.css b/src/styles.css
index 00d6ea0..4bfe613 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -609,6 +609,32 @@ body {
   line-height: 22px;
 }
 
+.target-align-control {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.target-align-label {
+  font-size: 14px;
+  font-weight: 600;
+  color: #000;
+  line-height: 1;
+  white-space: nowrap;
+}
+
+.target-align-select {
+  min-width: 88px;
+  height: 24px;
+  border: 1px solid #c9aee0;
+  border-radius: 2px;
+  background: #fff;
+  color: #1d2129;
+  font-size: 14px;
+  padding: 0 20px 0 6px;
+  line-height: 22px;
+}
+
 .example-line {
   margin: 4px 0 8px;
   color: var(--text-4);
@@ -694,6 +720,10 @@ body {
     margin-left: 0;
   }
 
+  .target-align-control {
+    margin-left: 0;
+  }
+
   .footer {
     font-size: 14px;
   }