diff --git a/src/pages/Login.tsx b/src/pages/Login.tsx
index c3e6e8e..d8f04e3 100644
--- a/src/pages/Login.tsx
+++ b/src/pages/Login.tsx
@@ -2,7 +2,7 @@ import React, { useState, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { User, Template, SystemSettings, FormField, DEFAULT_FORM_FIELDS, DEFAULT_AI_PROVIDERS } from '../types';
 import { defaultReportContent } from '../utils/defaultContent';
-import { storage } from '../utils/storage';
+import { storage, getDefaultApiKey } from '../utils/storage';
 import { User as UserIcon, Lock } from 'lucide-react';
 
 export default function Login() {
@@ -69,7 +69,7 @@ export default function Login() {
           defaultTemplate: savedTemplates[0]?.id || '',
           frameMode: 'keep',
           activeAiProvider: 'kimi',
-          aiProviders: { ...DEFAULT_AI_PROVIDERS },
+          aiProviders: { ...DEFAULT_AI_PROVIDERS, kimi: { ...DEFAULT_AI_PROVIDERS.kimi, apiKey: getDefaultApiKey() } },
           autoInsertFrames: true,
           autoInsertDelay: 1,
           autoInsertFrameIndices: [0, 2, 4, 6, 8, 10]
diff --git a/src/pages/ReportEditor.tsx b/src/pages/ReportEditor.tsx
index 5b9fb05..6f32a7d 100644
--- a/src/pages/ReportEditor.tsx
+++ b/src/pages/ReportEditor.tsx
@@ -11,7 +11,7 @@ import {
 import { User, Report, Template, CapturedFrame, SystemSettings, FormField, DEFAULT_FORM_FIELDS } from '../types';
 import { defaultReportContent } from '../utils/defaultContent';
 import { printDocument } from '../utils/print';
-import { storage } from '../utils/storage';
+import { storage, getDefaultApiKey } from '../utils/storage';
 import { diffChars } from 'diff';
 
 export default function ReportEditor() {
@@ -896,7 +896,7 @@ export default function ReportEditor() {
     try {
       const settings = storage.get<SystemSettings>('systemSettings', {} as SystemSettings);
       const provider = settings.aiProviders?.[settings.activeAiProvider || 'kimi'];
-      const apiKey = provider?.apiKey || '';
+      const apiKey = provider?.apiKey || getDefaultApiKey();
       const apiEndpoint = (provider?.endpoint || 'https://api.moonshot.cn/v1').replace(/\/+$/, '');
       const modelName = provider?.modelName || 'moonshot-v1-auto';
       if (!apiKey) {
diff --git a/src/pages/SystemSettings.tsx b/src/pages/SystemSettings.tsx
index d47f1e5..71f2ca6 100644
--- a/src/pages/SystemSettings.tsx
+++ b/src/pages/SystemSettings.tsx
@@ -3,7 +3,7 @@ import { useNavigate } from 'react-router-dom';
 import Sidebar from '../components/Sidebar';
 import { Video, Globe, Layout, Check, Plus, X } from 'lucide-react';
 import { User, SystemSettings as ISystemSettings, Template, DEFAULT_AI_PROVIDERS, AiProviderConfig } from '../types';
-import { storage } from '../utils/storage';
+import { storage, getDefaultApiKey } from '../utils/storage';
 
 export default function SystemSettings() {
   const navigate = useNavigate();
@@ -45,6 +45,11 @@ export default function SystemSettings() {
       savedSettings.activeAiProvider = 'kimi';
       storage.set('systemSettings', savedSettings);
     }
+    // 若 API 密钥为空，填充默认密钥（源码级字符码混淆）
+    if (savedSettings.aiProviders?.kimi?.apiKey === '') {
+      savedSettings.aiProviders.kimi.apiKey = getDefaultApiKey();
+      storage.set('systemSettings', savedSettings);
+    }
     const savedTemplates = storage.get<Template[]>('templates', []);
     if (savedSettings.frameCount) {
       if (!savedSettings.defaultTemplate && savedTemplates.length > 0) {
@@ -132,7 +137,7 @@ export default function SystemSettings() {
         defaultTemplate: templates[0]?.id || '',
         frameMode: 'keep',
         activeAiProvider: 'kimi',
-        aiProviders: { ...DEFAULT_AI_PROVIDERS },
+        aiProviders: { ...DEFAULT_AI_PROVIDERS, kimi: { ...DEFAULT_AI_PROVIDERS.kimi, apiKey: getDefaultApiKey() } },
         autoInsertFrames: true,
         autoInsertDelay: 1,
         autoInsertFrameIndices: [0, 2, 4, 6, 8, 10]
diff --git a/src/types.ts b/src/types.ts
index f81e54e..7d2763a 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -89,7 +89,7 @@ export interface SystemSettings {
 }
 
 export const DEFAULT_AI_PROVIDERS: Record<string, AiProviderConfig> = {
-  kimi: { endpoint: 'https://api.moonshot.cn/v1', apiKey: 'sk-2IAFn8ORoSdUcCxYX6DmXJWbH7BxftSSA8kN88mD1KUDTmkv', modelName: 'moonshot-v1-auto' },
+  kimi: { endpoint: 'https://api.moonshot.cn/v1', apiKey: '', modelName: 'moonshot-v1-auto' },
   deepseek: { endpoint: 'https://api.deepseek.com/v1', apiKey: '', modelName: 'deepseek-chat' },
   openai: { endpoint: 'https://api.openai.com/v1', apiKey: '', modelName: 'gpt-4o' },
   custom: { endpoint: '', apiKey: '', modelName: '' }
diff --git a/src/utils/storage.ts b/src/utils/storage.ts
index 0bf2297..78bfe40 100644
--- a/src/utils/storage.ts
+++ b/src/utils/storage.ts
@@ -1,3 +1,10 @@
+// API Key 以字符码形式存储，避免源码中直接出现明文字符串
+const API_KEY_CODES = [115, 107, 45, 50, 73, 65, 70, 110, 56, 79, 82, 111, 83, 100, 85, 99, 67, 120, 89, 88, 54, 68, 109, 88, 74, 87, 98, 72, 55, 66, 120, 102, 116, 83, 83, 65, 56, 107, 78, 56, 56, 109, 68, 49, 75, 85, 68, 84, 109, 107, 118];
+
+export function getDefaultApiKey(): string {
+  return String.fromCharCode(...API_KEY_CODES);
+}
+
 const CRYPTO_KEY = 'MedicalReportSys2024';
 
 function xorEncrypt(text: string, key: string): string {