diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2256785..7725bf7f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,11 @@
 
 ## [Unreleased]
 
+### 修复
+
+- 知识库文本文档编辑抽屉在「编辑」模式下点「保存」无响应（`name`/`format` 字段未挂载时 `validateFields` 缺值导致抛错被吞掉；#592）
+- 知识库文本文档编辑内容未改时点「保存」只关闭抽屉，不触发更新与重建索引
+
 ## [0.9.32] - 2026-09-06
 
 ### 新增
diff --git a/dashboard/src/pages/KnowledgeBases/TextDocumentEditorModal.test.tsx b/dashboard/src/pages/KnowledgeBases/TextDocumentEditorModal.test.tsx
new file mode 100644
index 00000000..c67e674a
--- /dev/null
+++ b/dashboard/src/pages/KnowledgeBases/TextDocumentEditorModal.test.tsx
@@ -0,0 +1,101 @@
+/**
+ * Edit-mode Save used to call `values.name.trim()` even though the name field
+ * is not mounted — validateFields() omits it, so the click threw and was
+ * swallowed (GitHub #592).
+ */
+
+import { describe, it, expect, vi } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+
+import TextDocumentEditorModal from "./TextDocumentEditorModal";
+
+describe("<TextDocumentEditorModal />", () => {
+  it("submits edit-mode content without a mounted name field", async () => {
+    const user = userEvent.setup();
+    const onSubmit = vi.fn().mockResolvedValue(undefined);
+
+    render(
+      <TextDocumentEditorModal
+        open
+        mode="edit"
+        initialName="高德地图.md"
+        initialFormat="md"
+        initialContent={"line1\n"}
+        onCancel={() => undefined}
+        onSubmit={onSubmit}
+      />,
+    );
+
+    const editor = screen.getByPlaceholderText(
+      "knowledgeBases.fileContentPlaceholder",
+    );
+    await user.clear(editor);
+    await user.type(editor, "updated body");
+
+    await user.click(screen.getByRole("button", { name: "common.save" }));
+
+    await waitFor(() => expect(onSubmit).toHaveBeenCalledTimes(1));
+    expect(onSubmit).toHaveBeenCalledWith({
+      name: "高德地图.md",
+      format: "md",
+      content: "updated body",
+    });
+  });
+
+  it("closes without submitting when edit-mode content is unchanged", async () => {
+    const user = userEvent.setup();
+    const onCancel = vi.fn();
+    const onSubmit = vi.fn().mockResolvedValue(undefined);
+
+    render(
+      <TextDocumentEditorModal
+        open
+        mode="edit"
+        initialName="高德地图.md"
+        initialFormat="md"
+        initialContent={"same body\n"}
+        onCancel={onCancel}
+        onSubmit={onSubmit}
+      />,
+    );
+
+    await user.click(screen.getByRole("button", { name: "common.save" }));
+
+    await waitFor(() => expect(onCancel).toHaveBeenCalledTimes(1));
+    expect(onSubmit).not.toHaveBeenCalled();
+  });
+
+  it("submits when edit-mode content changes by a single character", async () => {
+    const user = userEvent.setup();
+    const onCancel = vi.fn();
+    const onSubmit = vi.fn().mockResolvedValue(undefined);
+
+    render(
+      <TextDocumentEditorModal
+        open
+        mode="edit"
+        initialName="高德地图.md"
+        initialFormat="md"
+        initialContent={"same body"}
+        onCancel={onCancel}
+        onSubmit={onSubmit}
+      />,
+    );
+
+    const editor = screen.getByPlaceholderText(
+      "knowledgeBases.fileContentPlaceholder",
+    );
+    await user.type(editor, "!");
+
+    await user.click(screen.getByRole("button", { name: "common.save" }));
+
+    await waitFor(() => expect(onSubmit).toHaveBeenCalledTimes(1));
+    expect(onSubmit).toHaveBeenCalledWith({
+      name: "高德地图.md",
+      format: "md",
+      content: "same body!",
+    });
+    expect(onCancel).not.toHaveBeenCalled();
+  });
+});
diff --git a/dashboard/src/pages/KnowledgeBases/TextDocumentEditorModal.tsx b/dashboard/src/pages/KnowledgeBases/TextDocumentEditorModal.tsx
index 4ca4ef31..af745204 100644
--- a/dashboard/src/pages/KnowledgeBases/TextDocumentEditorModal.tsx
+++ b/dashboard/src/pages/KnowledgeBases/TextDocumentEditorModal.tsx
@@ -79,14 +79,36 @@ export default function TextDocumentEditorModal({
   const handleOk = async () => {
     try {
       const values = await form.validateFields();
+      const name = String(values.name ?? initialName ?? "").trim();
+      const format = values.format ?? initialFormat;
+      const nextContent = values.content ?? "";
+
+      // Edit mode: unchanged content → just close; skip API / reindex.
+      if (mode === "edit" && nextContent === initialContent) {
+        onCancel();
+        return;
+      }
+
       setSubmitting(true);
       await onSubmit({
-        name: values.name.trim(),
-        format: values.format,
-        content: values.content ?? "",
+        // Edit mode does not mount name/format fields, so validateFields() may
+        // omit them — fall back to the props used to open the drawer.
+        name,
+        format,
+        content: nextContent,
       });
-    } catch {
-      // validation errors stay in the form
+    } catch (error) {
+      // Ant Design validation rejects with `{ errorFields }`; keep those silent.
+      // Real submit failures are handled inside `onSubmit` (toast) and must not
+      // be mistaken for a no-op click.
+      if (
+        error &&
+        typeof error === "object" &&
+        "errorFields" in error &&
+        Array.isArray((error as { errorFields?: unknown }).errorFields)
+      ) {
+        return;
+      }
     } finally {
       setSubmitting(false);
     }