diff --git a/miniapp/pages/index/index.js b/miniapp/pages/index/index.js
index d86cc20..4c9dc84 100644
--- a/miniapp/pages/index/index.js
+++ b/miniapp/pages/index/index.js
@@ -75,6 +75,18 @@ function getBaseNameFromPath(filePath) {
   return segments[segments.length - 1] || '';
 }
 
+/**
+ * 上传框文案只显示文件名，不展示路径和统计信息。
+ * 详细信息统一放到“信息日志”区域，避免主界面过长文本挤压。
+ */
+function buildUploadMessage(fileName, sourceType) {
+  const baseName = getBaseNameFromPath(fileName) || '未知文件';
+  if (sourceType === 'default') {
+    return `默认加载：${baseName}`;
+  }
+  return `已加载：${baseName}`;
+}
+
 const FALLBACK_THEME_COLORS = ['#9b6bc2', '#7e95f7', '#4cc9f0', '#f4a261'];
 
 /**
@@ -755,7 +767,7 @@ Page({
       DEFAULT_THEME_INDEX,
       Array.isArray(themePresets) ? themePresets.length : 0
     ),
-    uploadMessage: '默认加载 data/sankey.xlsx 中...',
+    uploadMessage: buildUploadMessage(DEFAULT_SANKEY_FILE_NAME, 'default'),
     parseError: '',
     buildError: '',
     columnHeaders: [],
@@ -778,6 +790,12 @@ Page({
     infoLogs: ['解析信息: 正在加载默认数据文件 data/sankey.xlsx'],
     sankeyLinks: [],
     sankeyNodes: [],
+    loadedFileName: '',
+    loadedFilePath: '',
+    loadedFileSourceType: '',
+    // 同步 canvas 逻辑分辨率，避免默认 300x150 被拉伸后出现裁剪。
+    previewCanvasWidth: 300,
+    previewCanvasHeight: 150,
     gapOptions: GAP_OPTIONS,
     gapOptionIndex: 1,
     nodeGap: GAP_OPTIONS[1],
@@ -1051,7 +1069,10 @@ Page({
       success(readRes) {
         try {
           const table = parseTableByFileName(fileName, readRes.data);
-          that.applyParsedTable(table, fileName);
+          that.applyParsedTable(table, fileName, {
+            sourceType: 'upload',
+            fullPath: filePath
+          });
         } catch (error) {
           that.setData({
             parseError: toFriendlyParseError(error, '文件解析失败')
@@ -1093,7 +1114,10 @@ Page({
         return;
       }
 
-      that.applyParsedTable(defaultSankeyTable, `${DEFAULT_SANKEY_FILE_NAME}（内置回退）`);
+      that.applyParsedTable(defaultSankeyTable, DEFAULT_SANKEY_FILE_NAME, {
+        sourceType: 'default',
+        fullPath: 'miniapp/data/sankey.default.js（内置回退）'
+      });
     };
 
     const tryReadByIndex = (index, lastErrorMessage) => {
@@ -1108,7 +1132,10 @@ Page({
         success(readRes) {
           try {
             const table = parseTableByFileName(DEFAULT_SANKEY_FILE_NAME, readRes.data);
-            that.applyParsedTable(table, DEFAULT_SANKEY_FILE_NAME);
+            that.applyParsedTable(table, DEFAULT_SANKEY_FILE_NAME, {
+              sourceType: 'default',
+              fullPath: candidatePath
+            });
           } catch (error) {
             that.setData({
               uploadMessage: '点击上传或将csv/xls文件拖到这里上传',
@@ -1164,9 +1191,14 @@ Page({
   /**
    * 应用解析结果，并按 Web 规则设置默认映射后触发重建。
    */
-  applyParsedTable(table, fileName) {
+  applyParsedTable(table, fileName, options) {
     const headers = table.headers || [];
     const rows = table.rows || [];
+    const sourceType = options && options.sourceType === 'default' ? 'default' : 'upload';
+    const fullPath =
+      options && typeof options.fullPath === 'string' && options.fullPath
+        ? options.fullPath
+        : '';
     const sourceByName = findHeaderIndex(headers, ['data', 'value', '数据', '值']);
     const sourceBySecondRow = findNumericColumnFromSecondRow(rows);
     const sourceDescByName = findHeaderIndex(headers, ['source', '源']);
@@ -1179,9 +1211,12 @@ Page({
 
     this.setData(
       {
-        uploadMessage: `已加载: ${fileName}（${rows.length} 行）`,
+        uploadMessage: buildUploadMessage(fileName, sourceType),
         parseError: '',
         buildError: '',
+        loadedFileName: getBaseNameFromPath(fileName) || fileName || '',
+        loadedFilePath: fullPath,
+        loadedFileSourceType: sourceType,
         columnHeaders: headers.length > 0 ? headers : [],
         tableRows: rows,
         sourceDataColumn,
@@ -1344,6 +1379,20 @@ Page({
     const logs = [];
     const rows = this.data.tableRows || [];
     const headers = this.data.columnHeaders || [];
+    const loadedFileName = this.data.loadedFileName || '';
+    const loadedFilePath = this.data.loadedFilePath || '';
+    const loadedFileSourceType = this.data.loadedFileSourceType || '';
+
+    if (loadedFileName) {
+      logs.push(`解析信息: 当前文件 ${loadedFileName}`);
+    }
+    if (loadedFileSourceType) {
+      logs.push(`解析信息: 数据来源 ${loadedFileSourceType === 'default' ? '默认文件' : '用户上传'}`);
+    }
+    if (loadedFilePath) {
+      logs.push(`解析信息: 文件路径 ${loadedFilePath}`);
+    }
+
     if (rows.length > 0) {
       logs.push(`解析信息: 已加载 ${rows.length} 行，${headers.length} 列`);
       logs.push(`解析信息: 已生成 ${this.data.nodesCount} 个节点，${this.data.linksCount} 条连线`);
@@ -1388,8 +1437,25 @@ Page({
         return;
       }
 
-      const width = rect.width;
-      const height = rect.height;
+      const width = Math.max(1, Math.round(rect.width));
+      const height = Math.max(1, Math.round(rect.height));
+
+      // 小程序 canvas 默认逻辑尺寸是 300x150。
+      // 若不把逻辑尺寸同步到容器尺寸，超过 300/150 的坐标会被裁剪，
+      // 视觉上会出现“节点明明应在最右侧，却停在约 2/3 位置”的问题。
+      if (this.data.previewCanvasWidth !== width || this.data.previewCanvasHeight !== height) {
+        this.setData(
+          {
+            previewCanvasWidth: width,
+            previewCanvasHeight: height
+          },
+          () => {
+            this.drawSankey();
+          }
+        );
+        return;
+      }
+
       const ctx = wx.createCanvasContext('sankeyCanvas', this);
       ctx.clearRect(0, 0, width, height);
       ctx.setFillStyle('#f7f8fa');
diff --git a/miniapp/pages/index/index.wxml b/miniapp/pages/index/index.wxml
index 9e3e540..d6bf849 100644
--- a/miniapp/pages/index/index.wxml
+++ b/miniapp/pages/index/index.wxml
@@ -76,7 +76,13 @@
 
     <text wx:if="{{buildError}}" class="error-text" user-select>{{buildError}}</text>
     <text wx:if="{{parseError}}" class="error-text" user-select>{{parseError}}</text>
-    <canvas class="preview-canvas" canvas-id="sankeyCanvas" id="sankeyCanvas" />
+    <canvas
+      class="preview-canvas"
+      canvas-id="sankeyCanvas"
+      id="sankeyCanvas"
+      width="{{previewCanvasWidth}}"
+      height="{{previewCanvasHeight}}"
+    />
   </view>
 
   <view class="bottom-panels" style="height: {{bottomPanelsHeightPx}}px;">