diff --git a/.vscode/settings.json b/.vscode/settings.json
index de6ec333..ca76c952 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,5 +1,3 @@
 {
-    "cSpell.words": [
-        "drawnix"
-    ]
-}
\ No newline at end of file
+  "cSpell.words": ["drawnix"]
+}
diff --git a/apps/web/src/app/app.tsx b/apps/web/src/app/app.tsx
index 662bc74e..f5aa73d0 100644
--- a/apps/web/src/app/app.tsx
+++ b/apps/web/src/app/app.tsx
@@ -1,8 +1,17 @@
 import { useState, useEffect } from 'react';
 import { initializeData } from './initialize-data';
 import { Drawnix } from '@drawnix/drawnix';
-import { PlaitBoard, PlaitElement, PlaitTheme, Viewport } from '@plait/core';
+import {
+  PlaitBoard,
+  PlaitElement,
+  PlaitTheme,
+  Viewport,
+  ThemeColorMode,
+  BoardTransforms,
+} from '@plait/core';
+import { BoardChangeData } from '@plait-board/react-board';
 import localforage from 'localforage';
+import { loadThemeFromStorage, saveThemeToStorage } from '@drawnix/drawnix';
 
 // 1个月后移出删除兼容
 const OLD_DRAWNIX_LOCAL_DATA_KEY = 'drawnix-local-data';
@@ -23,20 +32,42 @@ export function App() {
 
   useEffect(() => {
     const loadData = async () => {
+      // Load saved theme from localStorage
+      const savedTheme = loadThemeFromStorage();
+
       const storedData = await localforage.getItem(MAIN_BOARD_CONTENT_KEY);
       if (storedData) {
-        setValue(storedData as any);
+        const data = storedData as any;
+        // Always use theme from localStorage, not from stored data
+        setValue({
+          children: data.children,
+          viewport: data.viewport,
+          theme: { themeColorMode: savedTheme || ThemeColorMode.default },
+        });
         return;
       }
       const localData = localStorage.getItem(OLD_DRAWNIX_LOCAL_DATA_KEY);
       if (localData) {
         const parsedData = JSON.parse(localData);
-        setValue(parsedData);
-        await localforage.setItem(MAIN_BOARD_CONTENT_KEY, parsedData);
+        // Use theme from localStorage, not from old data
+        setValue({
+          children: parsedData.children,
+          viewport: parsedData.viewport,
+          theme: { themeColorMode: savedTheme || ThemeColorMode.default },
+        });
+        // Save only children and viewport to new storage
+        await localforage.setItem(MAIN_BOARD_CONTENT_KEY, {
+          children: parsedData.children,
+          viewport: parsedData.viewport,
+        });
         localStorage.removeItem(OLD_DRAWNIX_LOCAL_DATA_KEY);
         return;
       }
-      setValue({ children: initializeData });
+      // For new users, use saved theme or default
+      setValue({
+        children: initializeData,
+        theme: { themeColorMode: savedTheme || ThemeColorMode.default },
+      });
     };
 
     loadData();
@@ -46,11 +77,37 @@ export function App() {
       value={value.children}
       viewport={value.viewport}
       theme={value.theme}
-      onChange={(value) => {
-        localforage.setItem(MAIN_BOARD_CONTENT_KEY, value);
+      //@ts-ignore
+      onChange={(boardData: BoardChangeData) => {
+        // Save theme to localStorage when it changes
+        if (boardData.theme?.themeColorMode) {
+          saveThemeToStorage(boardData.theme.themeColorMode);
+        }
+
+        // Don't save theme to localforage - only save content and viewport
+        const newValue = {
+          children: boardData.children,
+          viewport: boardData.viewport,
+          theme: boardData.theme, // Keep for state but don't persist
+        };
+        setValue(newValue);
+
+        // Only save children and viewport to localforage, not theme
+        localforage.setItem(MAIN_BOARD_CONTENT_KEY, {
+          children: boardData.children,
+          viewport: boardData.viewport,
+        });
       }}
       afterInit={(board) => {
         console.log('board initialized');
+
+        // Ensure the saved theme is applied after board initialization
+        const savedTheme = loadThemeFromStorage();
+        if (savedTheme && board.theme.themeColorMode !== savedTheme) {
+          console.log('Applying saved theme after board init:', savedTheme);
+          BoardTransforms.updateThemeColor(board, savedTheme);
+        }
+
         console.log(
           `add __drawnix__web__debug_log to window, so you can call add log anywhere, like: window.__drawnix__web__console('some thing')`
         );
diff --git a/packages/drawnix/src/components/toolbar/app-toolbar/app-menu-items.tsx b/packages/drawnix/src/components/toolbar/app-toolbar/app-menu-items.tsx
index ccdcb6ef..f0c88812 100644
--- a/packages/drawnix/src/components/toolbar/app-toolbar/app-menu-items.tsx
+++ b/packages/drawnix/src/components/toolbar/app-toolbar/app-menu-items.tsx
@@ -63,7 +63,7 @@ export const OpenFile = () => {
       data-testid="open-button"
       onSelect={() => {
         loadFromJSON(board).then((data) => {
-          clearAndLoad(data.elements, data.viewport);
+          clearAndLoad(data.elements, data.viewport, data.theme);
         });
       }}
       icon={OpenFileIcon}
@@ -84,13 +84,15 @@ export const SaveAsImage = () => {
         saveAsImage(board, true);
       }}
       submenu={
-        <Menu onSelect={() => {
-          const itemSelectEvent = new CustomEvent(EVENT.MENU_ITEM_SELECT, {
-            bubbles: true,
-            cancelable: true,
-          });
-          menuContentProps.onSelect?.(itemSelectEvent);
-        }}>
+        <Menu
+          onSelect={() => {
+            const itemSelectEvent = new CustomEvent(EVENT.MENU_ITEM_SELECT, {
+              bubbles: true,
+              cancelable: true,
+            });
+            menuContentProps.onSelect?.(itemSelectEvent);
+          }}
+        >
           <MenuItem
             onSelect={() => {
               saveAsImage(board, true);
diff --git a/packages/drawnix/src/components/toolbar/creation-toolbar.tsx b/packages/drawnix/src/components/toolbar/creation-toolbar.tsx
index 334c05bc..f73ba7b9 100644
--- a/packages/drawnix/src/components/toolbar/creation-toolbar.tsx
+++ b/packages/drawnix/src/components/toolbar/creation-toolbar.tsx
@@ -1,3 +1,4 @@
+import React from 'react';
 import classNames from 'classnames';
 import { Island } from '../island';
 import Stack from '../stack';
@@ -156,7 +157,7 @@ export const CreationToolbar = () => {
       <Stack.Row gap={1}>
         {BUTTONS.map((button, index) => {
           if (appState.isMobile && button.pointer === PlaitPointerType.hand) {
-            return <></>;
+            return <React.Fragment key={index}></React.Fragment>;
           }
           if (button.key === PopupKey.shape) {
             return (
diff --git a/packages/drawnix/src/components/toolbar/theme-toolbar.tsx b/packages/drawnix/src/components/toolbar/theme-toolbar.tsx
index 5389d329..71d9b524 100644
--- a/packages/drawnix/src/components/toolbar/theme-toolbar.tsx
+++ b/packages/drawnix/src/components/toolbar/theme-toolbar.tsx
@@ -17,8 +17,8 @@ export const ThemeToolbar = () => {
     >
       <select
         onChange={(e) => {
-          const value = (e.target as HTMLSelectElement).value;
-          BoardTransforms.updateThemeColor(board, value as ThemeColorMode);
+          const value = (e.target as HTMLSelectElement).value as ThemeColorMode;
+          BoardTransforms.updateThemeColor(board, value);
         }}
         value={theme.themeColorMode}
       >
diff --git a/packages/drawnix/src/data/json.ts b/packages/drawnix/src/data/json.ts
index 2787012c..98a652a1 100644
--- a/packages/drawnix/src/data/json.ts
+++ b/packages/drawnix/src/data/json.ts
@@ -52,6 +52,7 @@ export const serializeAsJSON = (board: PlaitBoard): string => {
     source: 'web',
     elements: board.children,
     viewport: board.viewport,
+    theme: board.theme,
   };
 
   return JSON.stringify(data, null, 2);
diff --git a/packages/drawnix/src/data/types.ts b/packages/drawnix/src/data/types.ts
index 2eb6220b..cb0308ac 100644
--- a/packages/drawnix/src/data/types.ts
+++ b/packages/drawnix/src/data/types.ts
@@ -1,4 +1,4 @@
-import { PlaitElement, Viewport } from '@plait/core';
+import { PlaitElement, PlaitTheme, Viewport } from '@plait/core';
 
 export interface DrawnixExportedData {
   type: DrawnixExportedType.drawnix;
@@ -6,8 +6,9 @@ export interface DrawnixExportedData {
   source: 'web';
   elements: PlaitElement[];
   viewport: Viewport;
+  theme?: PlaitTheme;
 }
 
 export enum DrawnixExportedType {
-    drawnix = 'drawnix'
-}
\ No newline at end of file
+  drawnix = 'drawnix',
+}
diff --git a/packages/drawnix/src/utils/image.ts b/packages/drawnix/src/utils/image.ts
index e2ddc0a4..c5db564a 100644
--- a/packages/drawnix/src/utils/image.ts
+++ b/packages/drawnix/src/utils/image.ts
@@ -1,14 +1,79 @@
-import { getSelectedElements, PlaitBoard } from '@plait/core';
+import { getSelectedElements, PlaitBoard, ThemeColorMode } from '@plait/core';
 import { base64ToBlob, boardToImage, download } from './common';
 import { fileOpen } from '../data/filesystem';
 import { IMAGE_MIME_TYPES } from '../constants';
 import { insertImage } from '../data/image';
 
+// Get the actual background color from the board container
+const getThemeBackgroundColor = (board: PlaitBoard): string => {
+  try {
+    const boardContainer = PlaitBoard.getBoardContainer(board);
+
+    // Check multiple elements in the hierarchy for background color
+    const elementsToCheck = [
+      boardContainer,
+      boardContainer.parentElement,
+      boardContainer.closest('.drawnix'),
+      document.body,
+    ].filter(Boolean);
+
+    for (const element of elementsToCheck) {
+      if (element) {
+        const computedStyle = window.getComputedStyle(element as Element);
+        const backgroundColor = computedStyle.backgroundColor;
+
+        // If we find a non-transparent background color, use it
+        if (
+          backgroundColor &&
+          backgroundColor !== 'transparent' &&
+          backgroundColor !== 'rgba(0, 0, 0, 0)' &&
+          backgroundColor !== 'initial' &&
+          backgroundColor !== 'inherit'
+        ) {
+          return backgroundColor;
+        }
+      }
+    }
+
+    // If no background color found, use fallback
+    return getThemeBackgroundColorFallback(board.theme.themeColorMode);
+  } catch (error) {
+    console.warn(
+      'Could not get background color from DOM, using fallback',
+      error
+    );
+    return getThemeBackgroundColorFallback(board.theme.themeColorMode);
+  }
+};
+
+// Fallback theme background colors mapping
+const getThemeBackgroundColorFallback = (
+  themeColorMode: ThemeColorMode
+): string => {
+  switch (themeColorMode) {
+    case ThemeColorMode.dark:
+      return '#121212'; // Dark theme background (darker)
+    case ThemeColorMode.starry:
+      return '#0a0a1a'; // Starry theme background (very dark blue/purple)
+    case ThemeColorMode.retro:
+      return '#f4f1e8'; // Retro theme background (warm cream)
+    case ThemeColorMode.colorful:
+      return '#ffffff'; // Colorful theme background (pure white)
+    case ThemeColorMode.soft:
+      return '#f8f9fa'; // Soft theme background (very light gray)
+    case ThemeColorMode.default:
+    default:
+      return '#ffffff'; // Default theme background (white)
+  }
+};
+
 export const saveAsImage = (board: PlaitBoard, isTransparent: boolean) => {
   const selectedElements = getSelectedElements(board);
+  const themeBackgroundColor = getThemeBackgroundColor(board);
+
   boardToImage(board, {
     elements: selectedElements.length > 0 ? selectedElements : undefined,
-    fillStyle: isTransparent ? 'transparent' : 'white',
+    fillStyle: isTransparent ? 'transparent' : themeBackgroundColor,
   }).then((image) => {
     if (image) {
       const ext = isTransparent ? 'png' : 'jpg';
diff --git a/packages/drawnix/src/utils/index.ts b/packages/drawnix/src/utils/index.ts
index 7323ebcc..5ef73c9f 100644
--- a/packages/drawnix/src/utils/index.ts
+++ b/packages/drawnix/src/utils/index.ts
@@ -2,4 +2,5 @@ export * from './color';
 export * from './common';
 export * from './image';
 export * from './property';
-export * from './utility-types';
\ No newline at end of file
+export * from './utility-types';
+export * from './theme-storage';
diff --git a/packages/drawnix/src/utils/theme-storage.ts b/packages/drawnix/src/utils/theme-storage.ts
new file mode 100644
index 00000000..26ece17a
--- /dev/null
+++ b/packages/drawnix/src/utils/theme-storage.ts
@@ -0,0 +1,34 @@
+import { ThemeColorMode } from '@plait/core';
+
+const THEME_STORAGE_KEY = 'drawnix-theme';
+
+export const saveThemeToStorage = (theme: ThemeColorMode): void => {
+  try {
+    localStorage.setItem(THEME_STORAGE_KEY, theme);
+  } catch (error) {
+    console.warn('Failed to save theme to localStorage:', error);
+  }
+};
+
+export const loadThemeFromStorage = (): ThemeColorMode | null => {
+  try {
+    const savedTheme = localStorage.getItem(THEME_STORAGE_KEY);
+    if (
+      savedTheme &&
+      Object.values(ThemeColorMode).includes(savedTheme as ThemeColorMode)
+    ) {
+      return savedTheme as ThemeColorMode;
+    }
+  } catch (error) {
+    console.warn('Failed to load theme from localStorage:', error);
+  }
+  return null;
+};
+
+export const clearThemeFromStorage = (): void => {
+  try {
+    localStorage.removeItem(THEME_STORAGE_KEY);
+  } catch (error) {
+    console.warn('Failed to clear theme from localStorage:', error);
+  }
+};