diff --git a/renderer/renderer.js b/renderer/renderer.js
index 9df60d0..dae606e 100644
--- a/renderer/renderer.js
+++ b/renderer/renderer.js
@@ -63,6 +63,7 @@
   let viewMode = 'split';
   let updateTimer = null;
   let lineCountCache = 0;
+  let _loadingTab = false; // 加载 tab 内容期间跳过 input 事件的 isModified 标记
   let currentRootPath = null;
 
   // Search state
@@ -674,6 +675,7 @@
   function loadTabState(tab) {
     // 使用 execCommand('insertText') 替换内容，保留 undo/redo 历史
     // setRangeText 会清空 undo 栈，所以此处必须用 execCommand
+    _loadingTab = true;
     editor.focus();
     editor.select();
     const inserted = document.execCommand('insertText', false, tab.content);
@@ -699,6 +701,7 @@
 
     // Update modified state
     setModified(tab.isModified);
+    _loadingTab = false;
 
     // Notify main process about active file
     if (typeof window.electronAPI !== 'undefined') {
@@ -1101,9 +1104,12 @@
       if (!tab || !tab.filePath) return;
       const result = await window.electronAPI.reloadFile();
       if (result.success) {
+        _loadingTab = true;
         editor.value = result.content;
+        _loadingTab = false;
         tab.content = result.content;
         tab.isModified = false;
+        setModified(false);
         lineCountCache = 0;
         updateLineNumbers();
         renderMarkdown(result.content);
@@ -1149,6 +1155,7 @@
   // ===== Event Listeners =====
   function initEventListeners() {
     editor.addEventListener('input', () => {
+      if (_loadingTab) { scheduleUpdate(); return; } // 加载中不标记修改
       const tab = getActiveTab();
       if (tab) {
         tab.isModified = true;