diff --git a/js/app.js b/js/app.js
index 03f2eb3..f7637f6 100644
--- a/js/app.js
+++ b/js/app.js
@@ -1758,10 +1758,10 @@ async function handleProcessClick() {
 
     // 2. 检查 OCR 配置（如果有 PDF 文件）
     if (hasPdfFiles) {
-        let ocrEngine = 'mistral';
+        let ocrEngine = 'mineru';
         try {
             if (window.ocrSettingsManager && typeof window.ocrSettingsManager.getCurrentConfig === 'function') {
-                ocrEngine = window.ocrSettingsManager.getCurrentConfig().engine || 'mistral';
+                ocrEngine = window.ocrSettingsManager.getCurrentConfig().engine || 'mineru';
                 const validation = window.ocrSettingsManager.validateConfig();
                 if (!validation.valid) {
                     const engineNames = { mistral: 'Mistral OCR', mineru: 'MinerU', doc2x: 'Doc2X', none: '不需要 OCR' };
diff --git a/js/process/main.js b/js/process/main.js
index 0a51581..c530a75 100644
--- a/js/process/main.js
+++ b/js/process/main.js
@@ -137,13 +137,13 @@ const fileType = fileToProcess.name.split('.').pop().toLowerCase();
         let usedOcrEngine = null;
         let usedOcrSource = null;
         // 更合理的开始日志：显示 OCR 引擎而不是固定显示 Mistral Key
-        let ocrEngineForLog = 'mistral';
+        let ocrEngineForLog = 'mineru';
         try {
             if (typeof window !== 'undefined' && window.ocrSettingsManager && typeof window.ocrSettingsManager.getCurrentConfig === 'function') {
                 const cfg = window.ocrSettingsManager.getCurrentConfig();
                 if (cfg && cfg.engine) ocrEngineForLog = cfg.engine;
             } else {
-                ocrEngineForLog = localStorage.getItem('ocrEngine') || 'mistral';
+                ocrEngineForLog = localStorage.getItem('ocrEngine') || 'mineru';
             }
         } catch {}
         if (typeof addProgressLog === "function") {
diff --git a/js/process/ocr-manager.js b/js/process/ocr-manager.js
index b7de13f..3467a88 100644
--- a/js/process/ocr-manager.js
+++ b/js/process/ocr-manager.js
@@ -44,7 +44,7 @@ class OcrManager {
     }
 
     // Fallback: 直接从 localStorage 读取
-    const engine = localStorage.getItem('ocrEngine') || 'mistral';
+    const engine = localStorage.getItem('ocrEngine') || 'mineru';
 
     switch (engine) {
       case 'local':
diff --git a/js/ui/key-manager-ui.js b/js/ui/key-manager-ui.js
index e8b2ef0..289f283 100644
--- a/js/ui/key-manager-ui.js
+++ b/js/ui/key-manager-ui.js
@@ -711,7 +711,7 @@ KeyManagerUI.exportAllModelData = function() {
 
     // 添加 OCR 配置导出
     const ocrConfig = {
-        engine: localStorage.getItem('ocrEngine') || 'mistral',
+        engine: localStorage.getItem('ocrEngine') || 'mineru',  // 默认为 mineru
         mistralKeys: localStorage.getItem('ocrMistralKeys') || '',
         workerAuthKey: localStorage.getItem('ocrWorkerAuthKey') || '',
         mineruToken: localStorage.getItem('ocrMinerUToken') || '',
diff --git a/js/ui/ocr-settings.js b/js/ui/ocr-settings.js
index d5a1e2a..561194d 100644
--- a/js/ui/ocr-settings.js
+++ b/js/ui/ocr-settings.js
@@ -106,7 +106,7 @@ class OcrSettingsManager {
   loadSettings() {
     try {
       // 引擎选择
-      const engine = localStorage.getItem(this.keys.engine) || 'mistral';
+      const engine = localStorage.getItem(this.keys.engine) || 'mineru';
       if (this.elements.ocrEngine) {
         this.elements.ocrEngine.value = engine;
         this.switchEngine(engine); // 显示对应的配置面板
@@ -476,7 +476,7 @@ class OcrSettingsManager {
    * @returns {Object} 配置对象
    */
   getCurrentConfig() {
-    const engine = localStorage.getItem(this.keys.engine) || 'mistral';
+    const engine = localStorage.getItem(this.keys.engine) || 'mineru';
 
     switch (engine) {
       case 'none':
diff --git a/js/ui/ui-processing.js b/js/ui/ui-processing.js
index c8cbd6a..96bf23d 100644
--- a/js/ui/ui-processing.js
+++ b/js/ui/ui-processing.js
@@ -131,18 +131,18 @@
         const hasPdfFiles = effectiveFiles.some(file => file.name.toLowerCase().endsWith('.pdf'));
 
         // 检查 OCR 引擎与所需配置
-        let ocrEngine = 'mistral';
+        let ocrEngine = 'mineru';
         let ocrConfigValid = true;
         let ocrConfigMessage = '';
         try {
             if (window.ocrSettingsManager && typeof window.ocrSettingsManager.getCurrentConfig === 'function') {
-                ocrEngine = window.ocrSettingsManager.getCurrentConfig().engine || (localStorage.getItem('ocrEngine') || 'mistral');
+                ocrEngine = window.ocrSettingsManager.getCurrentConfig().engine || (localStorage.getItem('ocrEngine') || 'mineru');
                 // 使用 validateConfig 检查配置是否完整
                 const validation = window.ocrSettingsManager.validateConfig();
                 ocrConfigValid = validation.valid;
                 ocrConfigMessage = validation.message;
             } else {
-                ocrEngine = localStorage.getItem('ocrEngine') || 'mistral';
+                ocrEngine = localStorage.getItem('ocrEngine') || 'mineru';
             }
         } catch {}
 
diff --git a/js/ui/ui_model_manager_core.js b/js/ui/ui_model_manager_core.js
index 9608918..a6b99a6 100644
--- a/js/ui/ui_model_manager_core.js
+++ b/js/ui/ui_model_manager_core.js
@@ -186,13 +186,13 @@
       });
 
       // 检查当前 OCR 引擎配置
-      let currentOcrEngine = 'mistral';
+      let currentOcrEngine = 'mineru';
       let currentOcrConfigured = false;
       try {
         if (window.ocrSettingsManager && typeof window.ocrSettingsManager.getCurrentConfig === 'function') {
-          currentOcrEngine = window.ocrSettingsManager.getCurrentConfig().engine || (localStorage.getItem('ocrEngine') || 'mistral');
+          currentOcrEngine = window.ocrSettingsManager.getCurrentConfig().engine || (localStorage.getItem('ocrEngine') || 'mineru');
         } else {
-          currentOcrEngine = localStorage.getItem('ocrEngine') || 'mistral';
+          currentOcrEngine = localStorage.getItem('ocrEngine') || 'mineru';
         }
 
         if (currentOcrEngine === 'none' || currentOcrEngine === 'local') {