diff --git a/packages/zentao-api/src/types.ts b/packages/zentao-api/src/types.ts
index 3a26ea2..f6682fe 100644
--- a/packages/zentao-api/src/types.ts
+++ b/packages/zentao-api/src/types.ts
@@ -227,7 +227,6 @@ export interface ZentaoFileReadResult {
   fileID: number;
   fileType: string;
   mimeType: string;
-  encoding: "base64";
-  data: string;
+  data: Buffer;
   size: number;
 }
diff --git a/packages/zentao-api/src/zentao-legacy.ts b/packages/zentao-api/src/zentao-legacy.ts
index 0ff582e..c4cc4fb 100644
--- a/packages/zentao-api/src/zentao-legacy.ts
+++ b/packages/zentao-api/src/zentao-legacy.ts
@@ -1455,7 +1455,7 @@ export default class ZentaoLegacy extends Zentao {
   }
 
   /**
-   * 读取附件或图片文件，并返回 base64 编码内容。
+   * 读取附件或图片文件，并返回原始二进制内容。
    *
    * @param params 读取参数，其中 `params.fileID` 为文件 ID，`params.fileType` 为文件扩展名
    * @returns 文件读取结果
@@ -1474,8 +1474,7 @@ export default class ZentaoLegacy extends Zentao {
             fileID: params.fileID,
             fileType: params.fileType,
             mimeType: this.resolveFileMimeType(params.fileType),
-            encoding: "base64",
-            data: buffer.toString("base64"),
+            data: buffer,
             size: buffer.byteLength,
           } satisfies ZentaoFileReadResult,
         };
diff --git a/packages/zentao-api/test/zentao-legacy.test.ts b/packages/zentao-api/test/zentao-legacy.test.ts
index 0ebf58e..a47eb70 100644
--- a/packages/zentao-api/test/zentao-legacy.test.ts
+++ b/packages/zentao-api/test/zentao-legacy.test.ts
@@ -677,7 +677,7 @@ describe("ZentaoLegacy", () => {
     expectNthRequest(3, "?m=doc&f=ajaxGetDoc&docID=101&version=0&t=json");
   });
 
-  it("readFile 应返回 base64 编码文件内容及 MIME 类型", async () => {
+  it("readFile 应返回 Buffer 文件内容及 MIME 类型", async () => {
     mockLoginSuccessOnce();
     const raw = Uint8Array.from([72, 101, 108, 108, 111]).buffer;
     mockedAxios.request.mockResolvedValueOnce({
@@ -694,8 +694,7 @@ describe("ZentaoLegacy", () => {
       fileID: 9,
       fileType: "txt",
       mimeType: "text/plain",
-      encoding: "base64",
-      data: Buffer.from("Hello").toString("base64"),
+      data: Buffer.from("Hello"),
       size: 5,
     } satisfies ZentaoFileReadResult);
     expect(mockedAxios.request).toHaveBeenNthCalledWith(
diff --git a/packages/zentao-mcp/src/index.ts b/packages/zentao-mcp/src/index.ts
index 4d32b80..a41e8ba 100644
--- a/packages/zentao-mcp/src/index.ts
+++ b/packages/zentao-mcp/src/index.ts
@@ -45,6 +45,10 @@ import {
   ListToolsRequestSchema,
   Tool,
 } from "@modelcontextprotocol/sdk/types.js";
+import { randomUUID } from "node:crypto";
+import { promises as fs } from "node:fs";
+import os from "node:os";
+import path from "node:path";
 import dotenv from "dotenv";
 import yargs from "yargs";
 import { hideBin } from "yargs/helpers";
@@ -58,6 +62,8 @@ import {
   getString,
   type ZentaoCommandArgs,
 } from "./utils";
+
+import type { ZentaoFileReadResult } from "@acehubert/zentao-api";
 import type {
   ZentaoMcpOptions,
   BugType,
@@ -82,6 +88,33 @@ export function getZentaoMcpOptions(args: ZentaoCommandArgs): ZentaoMcpOptions {
   };
 }
 
+function normalizeFileExtension(fileType: string): string {
+  const normalized = fileType.trim().toLowerCase().replace(/^\.+/, "");
+  return normalized || "bin";
+}
+
+async function saveFileToTempDirectory(file: ZentaoFileReadResult): Promise<{
+  fileID: number;
+  fileType: string;
+  mimeType: string;
+  size: number;
+  filePath: string;
+}> {
+  const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "zentao-mcp-"));
+  const fileName = `zentao-file-${file.fileID}-${randomUUID()}.${normalizeFileExtension(file.fileType)}`;
+  const filePath = path.join(tempDir, fileName);
+
+  await fs.writeFile(filePath, file.data);
+
+  return {
+    fileID: file.fileID,
+    fileType: file.fileType,
+    mimeType: file.mimeType,
+    size: file.size,
+    filePath,
+  };
+}
+
 /** 命令参数优先，未传入时回退到环境变量。 */
 function resolveZentaoMcpOptions(options: ZentaoMcpOptions): ZentaoMcpOptions {
   return {
@@ -540,7 +573,7 @@ const tools: ZentaoTool[] = [
   {
     name: "zentao_file",
     supportVersions: [],
-    description: "文件读取。支持：读取附件/图片内容，返回 base64 编码结果",
+    description: "文件读取。支持：读取附件/图片内容，保存到系统临时目录并返回文件路径",
     inputSchema: {
       type: "object",
       properties: {
@@ -1127,6 +1160,8 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
           libID,
           docID,
           moduleID,
+          fileID,
+          fileType,
           title,
           content,
           keywords,
@@ -1141,6 +1176,8 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
           libID?: number;
           docID?: number;
           moduleID?: number;
+          fileID?: number;
+          fileType?: string;
           title?: string;
           content?: string;
           keywords?: string;
@@ -1270,6 +1307,22 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
             }
             break;
 
+          case "readFile":
+            if (!fileID) {
+              return {
+                content: [{ type: "text", text: "缺少必要参数: fileID（文件 ID）" }],
+                isError: true,
+              };
+            }
+            if (!fileType) {
+              return {
+                content: [{ type: "text", text: "缺少必要参数: fileType（文件类型）" }],
+                isError: true,
+              };
+            }
+            result = await saveFileToTempDirectory(await zentaoClient.readFile(fileID, fileType));
+            break;
+
           default:
             return {
               content: [{ type: "text", text: `未知操作类型: ${action}` }],
@@ -1301,7 +1354,7 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
                 isError: true,
               };
             }
-            result = await zentaoClient.readFile(fileID, fileType);
+            result = await saveFileToTempDirectory(await zentaoClient.readFile(fileID, fileType));
             break;
 
           default:
diff --git a/packages/zentao-mcp/src/types.ts b/packages/zentao-mcp/src/types.ts
index c00e621..c475c54 100644
--- a/packages/zentao-mcp/src/types.ts
+++ b/packages/zentao-mcp/src/types.ts
@@ -1,3 +1,5 @@
+import type { ZentaoFileReadResult } from "@acehubert/zentao-api";
+
 export interface ZentaoClientBaseOptions {
   url?: string;
   account?: string;
@@ -196,15 +198,6 @@ export interface ApiResponse<T = unknown> {
   message?: string;
 }
 
-export interface ZentaoFileReadResult {
-  fileID: number;
-  fileType: string;
-  mimeType: string;
-  encoding: "base64";
-  data: string;
-  size: number;
-}
-
 export type TestCaseType =
   | "feature"
   | "performance"
diff --git a/packages/zentao-mcp/src/zentao-clients/client-legacy.ts b/packages/zentao-mcp/src/zentao-clients/client-legacy.ts
index d3e43b4..0fcb3fd 100644
--- a/packages/zentao-mcp/src/zentao-clients/client-legacy.ts
+++ b/packages/zentao-mcp/src/zentao-clients/client-legacy.ts
@@ -1,4 +1,6 @@
 import { ZentaoLegacy } from "@acehubert/zentao-api";
+
+import type { ZentaoFileReadResult } from "@acehubert/zentao-api";
 import type {
   Bug,
   CloseBugParams,
@@ -20,7 +22,6 @@ import type {
   TestCaseListResponse,
   User,
   ZentaoClientConfig,
-  ZentaoFileReadResult,
   ZentaoClientVersion,
   IZentaoClient,
 } from "../types";
diff --git a/packages/zentao-mcp/src/zentao-clients/client-v1.ts b/packages/zentao-mcp/src/zentao-clients/client-v1.ts
index 4e6aa40..9f71f17 100644
--- a/packages/zentao-mcp/src/zentao-clients/client-v1.ts
+++ b/packages/zentao-mcp/src/zentao-clients/client-v1.ts
@@ -1,4 +1,7 @@
 import { ZentaoV1 } from "@acehubert/zentao-api";
+import { ZentaoClientLegacy } from "./client-legacy";
+
+import type { ZentaoFileReadResult } from "@acehubert/zentao-api";
 import type {
   Bug,
   CloseBugParams,
@@ -20,11 +23,9 @@ import type {
   TestCaseListResponse,
   User,
   ZentaoClientConfig,
-  ZentaoFileReadResult,
   ZentaoClientVersion,
   IZentaoClient,
 } from "../types";
-import { ZentaoClientLegacy } from "./client-legacy";
 
 /**
  * MCP v1 客户端适配器。
diff --git a/packages/zentao-mcp/src/zentao-clients/client-v2.ts b/packages/zentao-mcp/src/zentao-clients/client-v2.ts
index b40df54..205f42e 100644
--- a/packages/zentao-mcp/src/zentao-clients/client-v2.ts
+++ b/packages/zentao-mcp/src/zentao-clients/client-v2.ts
@@ -1,4 +1,6 @@
 import { ZentaoV2 } from "@acehubert/zentao-api";
+
+import type { ZentaoFileReadResult } from "@acehubert/zentao-api";
 import type {
   Bug,
   CloseBugParams,
@@ -20,7 +22,6 @@ import type {
   TestCaseListResponse,
   User,
   ZentaoClientConfig,
-  ZentaoFileReadResult,
   ZentaoClientVersion,
   IZentaoClient,
 } from "../types";