diff --git a/src/main/services/WindowService.ts b/src/main/services/WindowService.ts
index 7a427658..9b61682e 100644
--- a/src/main/services/WindowService.ts
+++ b/src/main/services/WindowService.ts
@@ -185,6 +185,7 @@ export class WindowService {
   private loadMainWindowContent(mainWindow: BrowserWindow) {
     if (is.dev && process.env['ELECTRON_RENDERER_URL']) {
       mainWindow.loadURL(process.env['ELECTRON_RENDERER_URL'])
+      mainWindow.webContents.openDevTools()
     } else {
       mainWindow.loadFile(join(__dirname, '../renderer/index.html'))
     }
diff --git a/src/renderer/src/hooks/useMermaid.ts b/src/renderer/src/hooks/useMermaid.ts
index 20f941d4..59771525 100644
--- a/src/renderer/src/hooks/useMermaid.ts
+++ b/src/renderer/src/hooks/useMermaid.ts
@@ -37,4 +37,32 @@ export const useMermaid = () => {
 
     setTimeout(renderMermaid, 100)
   }, [generating])
+
+  useEffect(() => {
+    const handleWheel = (e: WheelEvent) => {
+      if (e.ctrlKey || e.metaKey) {
+        e.preventDefault()
+        const mermaidElement = (e.target as HTMLElement).closest('.mermaid')
+        if (!mermaidElement) return
+
+        const svg = mermaidElement.querySelector('svg')
+        if (!svg) return
+
+        const currentScale = parseFloat(svg.style.transform?.match(/scale\((.*?)\)/)?.[1] || '1')
+        const delta = e.deltaY < 0 ? 0.1 : -0.1
+        const newScale = Math.max(0.1, Math.min(3, currentScale + delta))
+
+        const container = svg.parentElement
+        if (container) {
+          container.style.overflow = 'auto'
+          container.style.position = 'relative'
+          svg.style.transformOrigin = 'top left'
+          svg.style.transform = `scale(${newScale})`
+        }
+      }
+    }
+
+    document.addEventListener('wheel', handleWheel, { passive: false })
+    return () => document.removeEventListener('wheel', handleWheel)
+  }, [])
 }
diff --git a/src/renderer/src/i18n/locales/en-us.json b/src/renderer/src/i18n/locales/en-us.json
index feb079fa..38585876 100644
--- a/src/renderer/src/i18n/locales/en-us.json
+++ b/src/renderer/src/i18n/locales/en-us.json
@@ -217,6 +217,10 @@
         "png": "Download PNG",
         "svg": "Download SVG"
       },
+      "resize": {
+        "zoom-in": "Zoom In",
+        "zoom-out": "Zoom Out"
+      },
       "tabs": {
         "preview": "Preview",
         "source": "Source"
diff --git a/src/renderer/src/i18n/locales/ja-jp.json b/src/renderer/src/i18n/locales/ja-jp.json
index e3303a80..0c2e102a 100644
--- a/src/renderer/src/i18n/locales/ja-jp.json
+++ b/src/renderer/src/i18n/locales/ja-jp.json
@@ -217,6 +217,10 @@
         "png": "PNGをダウンロード",
         "svg": "SVGをダウンロード"
       },
+      "resize": {
+        "zoom-in": "拡大する",
+        "zoom-out": "ズームアウト"
+      },
       "tabs": {
         "preview": "プレビュー",
         "source": "ソース"
diff --git a/src/renderer/src/i18n/locales/ru-ru.json b/src/renderer/src/i18n/locales/ru-ru.json
index 8f4fa371..0eaf5e35 100644
--- a/src/renderer/src/i18n/locales/ru-ru.json
+++ b/src/renderer/src/i18n/locales/ru-ru.json
@@ -217,6 +217,10 @@
         "png": "Скачать PNG",
         "svg": "Скачать SVG"
       },
+      "resize": {
+        "zoom-in": "Yвеличить",
+        "zoom-out": "Yменьшить масштаб"
+      },
       "tabs": {
         "preview": "Предпросмотр",
         "source": "Исходный код"
diff --git a/src/renderer/src/i18n/locales/zh-cn.json b/src/renderer/src/i18n/locales/zh-cn.json
index c7b6fb40..5db74aaa 100644
--- a/src/renderer/src/i18n/locales/zh-cn.json
+++ b/src/renderer/src/i18n/locales/zh-cn.json
@@ -218,6 +218,10 @@
         "png": "下载 PNG",
         "svg": "下载 SVG"
       },
+      "resize": {
+        "zoom-in": "放大",
+        "zoom-out": "缩小"
+      },
       "tabs": {
         "preview": "预览",
         "source": "源码"
diff --git a/src/renderer/src/i18n/locales/zh-tw.json b/src/renderer/src/i18n/locales/zh-tw.json
index dbb2ad93..24d93b64 100644
--- a/src/renderer/src/i18n/locales/zh-tw.json
+++ b/src/renderer/src/i18n/locales/zh-tw.json
@@ -217,6 +217,10 @@
         "png": "下載 PNG",
         "svg": "下載 SVG"
       },
+      "resize": {
+        "zoom-in": "放大",
+        "zoom-out": "縮小"
+      },
       "tabs": {
         "preview": "預覽",
         "source": "原始碼"
diff --git a/src/renderer/src/pages/home/Markdown/MermaidPopup.tsx b/src/renderer/src/pages/home/Markdown/MermaidPopup.tsx
index 7fc15fd9..7c6b1676 100644
--- a/src/renderer/src/pages/home/Markdown/MermaidPopup.tsx
+++ b/src/renderer/src/pages/home/Markdown/MermaidPopup.tsx
@@ -18,6 +18,7 @@ const PopupContainer: React.FC<Props> = ({ resolve, chart }) => {
   const { t } = useTranslation()
   const mermaidId = `mermaid-popup-${Date.now()}`
   const [activeTab, setActiveTab] = useState('preview')
+  const [scale, setScale] = useState(1)
 
   const onOk = () => {
     setOpen(false)
@@ -31,6 +32,25 @@ const PopupContainer: React.FC<Props> = ({ resolve, chart }) => {
     resolve({})
   }
 
+  const handleZoom = (delta: number) => {
+    const newScale = Math.max(0.1, Math.min(3, scale + delta))
+    setScale(newScale)
+
+    const element = document.getElementById(mermaidId)
+    if (!element) return
+
+    const svg = element.querySelector('svg')
+    if (!svg) return
+
+    const container = svg.parentElement
+    if (container) {
+      container.style.overflow = 'auto'
+      container.style.position = 'relative'
+      svg.style.transformOrigin = 'top left'
+      svg.style.transform = `scale(${newScale})`
+    }
+  }
+
   const handleDownload = async (format: 'svg' | 'png') => {
     try {
       const element = document.getElementById(mermaidId)
@@ -110,6 +130,8 @@ const PopupContainer: React.FC<Props> = ({ resolve, chart }) => {
           {activeTab === 'source' && <Button onClick={() => handleCopy()}>{t('common.copy')}</Button>}
           {activeTab === 'preview' && (
             <>
+              <Button onClick={() => handleZoom(0.1)}>{t('mermaid.resize.zoom-in')}</Button>
+              <Button onClick={() => handleZoom(-0.1)}>{t('mermaid.resize.zoom-out')}</Button>
               <Button onClick={() => handleDownload('svg')}>{t('mermaid.download.svg')}</Button>
               <Button onClick={() => handleDownload('png')}>{t('mermaid.download.png')}</Button>
             </>