diff --git a/frontend/src/core/features/block_editor/blockeditor.css b/frontend/src/core/features/block_editor/blockeditor.css
index 173189a7c..f1510a851 100644
--- a/frontend/src/core/features/block_editor/blockeditor.css
+++ b/frontend/src/core/features/block_editor/blockeditor.css
@@ -169,7 +169,7 @@
   border: 1px solid #d1d5db;
   padding: 8px 12px;
   text-align: left;
-  min-width: 80px;
+  min-width: 35px;
   position: relative;
   transition: background-color 0.15s ease;
 }
diff --git a/frontend/src/core/features/block_editor/composables/useEditorSetup.ts b/frontend/src/core/features/block_editor/composables/useEditorSetup.ts
index a4b16c0cd..ad58d6dea 100644
--- a/frontend/src/core/features/block_editor/composables/useEditorSetup.ts
+++ b/frontend/src/core/features/block_editor/composables/useEditorSetup.ts
@@ -119,7 +119,7 @@ function buildExtensions(options: EditorSetupOptions): Extensions {
       HTMLAttributes: { class: 'code-block' },
     }),
     // ── Table 扩展组 ──
-    CustomTable.configure({ resizable: true }),
+    CustomTable.configure({ resizable: { cellMinWidth: 35 } }),
     TableRow,
     TableHeader,
     TableCell,
diff --git a/frontend/src/core/features/block_editor/extensions/custom-table.ts b/frontend/src/core/features/block_editor/extensions/custom-table.ts
index 4c93b26c7..cc67c6db5 100644
--- a/frontend/src/core/features/block_editor/extensions/custom-table.ts
+++ b/frontend/src/core/features/block_editor/extensions/custom-table.ts
@@ -5,7 +5,9 @@
  * 默认跟随内容宽度（非全宽），用户可通过行列菜单主动切换。
  */
 
+import { TextSelection } from '@tiptap/pm/state'
 import { Table } from '@tiptap/extension-table'
+import { createTable } from '@tiptap/extension-table'
 
 export const CustomTable = Table.extend({
   addAttributes() {
@@ -21,4 +23,40 @@ export const CustomTable = Table.extend({
       },
     }
   },
+
+  /**
+   * 重写 insertTable 命令，在创建表格时为每个 cell 注入 colwidth: [120]，
+   * 使新建表格的默认列宽为 120px（而非 tiptap cellMinWidth 的 35px 最小值）。
+   * 用户依旧可通过拖拽将列缩小到 cellMinWidth: 35px。
+   */
+  addCommands() {
+    return {
+      ...this.parent?.(),
+      insertTable:
+        ({ rows = 3, cols = 3, withHeaderRow = true } = {}) =>
+        ({ tr, dispatch, editor }) => {
+          const node = createTable(editor.schema, rows, cols, withHeaderRow)
+
+          if (!dispatch) return true
+
+          // 遍历 table，为每个 cell 设置 colwidth: [120]
+          const json = node.toJSON()
+          for (const row of json.content as any[]) {
+            if (!row.content) continue
+            for (const cell of row.content as any[]) {
+              cell.attrs = { ...cell.attrs, colwidth: [120] }
+            }
+          }
+
+          const newNode = editor.schema.nodeFromJSON(json)
+          const offset = tr.selection.from + 1
+
+          tr.replaceSelectionWith(newNode)
+            .scrollIntoView()
+            .setSelection(TextSelection.near(tr.doc.resolve(offset)))
+
+          return true
+        },
+    }
+  },
 })