diff --git a/packages/backend/src/settings/settings.controller.ts b/packages/backend/src/settings/settings.controller.ts
index e773635..e835e94 100644
--- a/packages/backend/src/settings/settings.controller.ts
+++ b/packages/backend/src/settings/settings.controller.ts
@@ -44,7 +44,9 @@ export const settingsController = {
           'fileManagerRowSizeMultiplier', // +++ 添加文件管理器行大小键 +++
           'fileManagerColWidths', // +++ 添加文件管理器列宽键 +++
           'commandInputSyncTarget', // +++ 添加命令输入同步目标键 +++
-          'timezone' // NEW: 添加时区键
+          'timezone', // NEW: 添加时区键
+          'rdpModalWidth', // NEW: 添加 RDP 模态框宽度键
+          'rdpModalHeight' // NEW: 添加 RDP 模态框高度键
       ];
       const filteredSettings: Record<string, string> = {};
       for (const key in settingsToUpdate) {
diff --git a/packages/frontend/src/components/RemoteDesktopModal.vue b/packages/frontend/src/components/RemoteDesktopModal.vue
index 0ec5d44..a8b2354 100644
--- a/packages/frontend/src/components/RemoteDesktopModal.vue
+++ b/packages/frontend/src/components/RemoteDesktopModal.vue
@@ -1,12 +1,14 @@
 <script setup lang="ts">
-import { ref, onMounted, onUnmounted, watch, nextTick, computed } from 'vue';
+import { ref, onMounted, onUnmounted, watch, nextTick, computed, watchEffect } from 'vue'; // Import watchEffect
 import { useI18n } from 'vue-i18n';
+import { useSettingsStore } from '../stores/settings.store'; // Import settings store
 // @ts-ignore - guacamole-common-js lacks official types
 import Guacamole from 'guacamole-common-js';
 import apiClient from '../utils/apiClient';
 import { ConnectionInfo } from '../stores/connections.store';
 
 const { t } = useI18n();
+const settingsStore = useSettingsStore(); // Instantiate settings store
 
 const props = defineProps<{
   connection: ConnectionInfo | null;
@@ -14,6 +16,10 @@ const props = defineProps<{
 
 const emit = defineEmits(['close']);
 
+let saveWidthTimeout: ReturnType<typeof setTimeout> | null = null;
+let saveHeightTimeout: ReturnType<typeof setTimeout> | null = null;
+const DEBOUNCE_DELAY = 500; // ms
+
 const rdpDisplayRef = ref<HTMLDivElement | null>(null);
 const rdpContainerRef = ref<HTMLDivElement | null>(null); // Added ref for the container
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -34,8 +40,7 @@ const MIN_MODAL_HEIGHT = 768;
 
 const RDP_BACKEND_API_BASE = 'http://localhost:9090';
 const RDP_BACKEND_WEBSOCKET_URL = 'ws://localhost:8081';
-const LOCAL_STORAGE_MODAL_WIDTH_KEY = 'rdpModalWidth'; // Reverted key name
-const LOCAL_STORAGE_MODAL_HEIGHT_KEY = 'rdpModalHeight'; // Reverted key name
+// Removed localStorage keys
 
 const connectRdp = async () => { // Removed useInputValues parameter
   if (!props.connection || !rdpDisplayRef.value) {
@@ -238,49 +243,54 @@ const closeModal = () => {
 // Removed setupResizeObserver as ResizeObserver is no longer used
 
 
-// Load desired MODAL size from localStorage on mount
-const loadDesiredModalSize = () => {
-  const savedWidth = localStorage.getItem(LOCAL_STORAGE_MODAL_WIDTH_KEY);
-  const savedHeight = localStorage.getItem(LOCAL_STORAGE_MODAL_HEIGHT_KEY);
-  if (savedWidth) {
-    // Validate loaded width against minimum
-    desiredModalWidth.value = Math.max(MIN_MODAL_WIDTH, parseInt(savedWidth, 10) || MIN_MODAL_WIDTH);
-  } else {
-     // Ensure default is also valid if nothing is saved
-     desiredModalWidth.value = Math.max(MIN_MODAL_WIDTH, desiredModalWidth.value);
-  }
-  if (savedHeight) {
-    // Validate loaded height against minimum
-    desiredModalHeight.value = Math.max(MIN_MODAL_HEIGHT, parseInt(savedHeight, 10) || MIN_MODAL_HEIGHT);
-  } else {
-    // Ensure default is also valid if nothing is saved
-    desiredModalHeight.value = Math.max(MIN_MODAL_HEIGHT, desiredModalHeight.value);
-  }
-};
+// Removed loadDesiredModalSize function
 
-// Save desired MODAL size to localStorage when changed
+// Watch local refs and save validated size to settings store
 watch(desiredModalWidth, (newWidth) => {
-  // Validate new width before saving and potentially update the ref
+  // Validate new width before saving
   const validatedWidth = Math.max(MIN_MODAL_WIDTH, Number(newWidth) || MIN_MODAL_WIDTH);
-  if (validatedWidth !== newWidth) {
-    // If validation changed the value, update the v-model binding
-    desiredModalWidth.value = validatedWidth;
-  }
-  localStorage.setItem(LOCAL_STORAGE_MODAL_WIDTH_KEY, String(validatedWidth));
-});
-watch(desiredModalHeight, (newHeight) => {
-  // Validate new height before saving and potentially update the ref
-  const validatedHeight = Math.max(MIN_MODAL_HEIGHT, Number(newHeight) || MIN_MODAL_HEIGHT);
-   if (validatedHeight !== newHeight) {
-     // If validation changed the value, update the v-model binding
-    desiredModalHeight.value = validatedHeight;
-  }
-  localStorage.setItem(LOCAL_STORAGE_MODAL_HEIGHT_KEY, String(validatedHeight));
+  // Debounce saving the *validated* width
+  if (saveWidthTimeout) clearTimeout(saveWidthTimeout);
+  saveWidthTimeout = setTimeout(() => {
+    // Only save the validated width, don't change the input value here
+    console.log(`[RDP Modal] Debounced Save - Saving width: ${validatedWidth} (Input value: ${newWidth})`);
+    settingsStore.updateSetting('rdpModalWidth', String(validatedWidth));
+  }, DEBOUNCE_DELAY);
 });
 
+watch(desiredModalHeight, (newHeight) => {
+  // Validate new height before saving
+  const validatedHeight = Math.max(MIN_MODAL_HEIGHT, Number(newHeight) || MIN_MODAL_HEIGHT);
+  // Debounce saving the *validated* height
+  if (saveHeightTimeout) clearTimeout(saveHeightTimeout);
+  saveHeightTimeout = setTimeout(() => {
+    // Only save the validated height, don't change the input value here
+    console.log(`[RDP Modal] Debounced Save - Saving height: ${validatedHeight} (Input value: ${newHeight})`);
+    settingsStore.updateSetting('rdpModalHeight', String(validatedHeight));
+  }, DEBOUNCE_DELAY);
+});
+
+// Load initial size from settings store when component mounts or settings change
+watchEffect(() => {
+  const storeWidth = settingsStore.settings.rdpModalWidth;
+  const storeHeight = settingsStore.settings.rdpModalHeight;
+  console.log(`[RDP Modal] Loading size from store - Width: ${storeWidth}, Height: ${storeHeight}`); // +++ Add log +++
+ 
+  // Use defaults from store if available, otherwise use component defaults
+  const initialWidth = storeWidth ? parseInt(storeWidth, 10) : desiredModalWidth.value; // Use current ref value as fallback default
+  const initialHeight = storeHeight ? parseInt(storeHeight, 10) : desiredModalHeight.value; // Use current ref value as fallback default
+
+  // Validate against minimums
+  const finalWidth = Math.max(MIN_MODAL_WIDTH, isNaN(initialWidth) ? MIN_MODAL_WIDTH : initialWidth);
+  const finalHeight = Math.max(MIN_MODAL_HEIGHT, isNaN(initialHeight) ? MIN_MODAL_HEIGHT : initialHeight);
+  console.log(`[RDP Modal] Applying validated size - Width: ${finalWidth}, Height: ${finalHeight}`); // +++ Add log +++
+  desiredModalWidth.value = finalWidth;
+  desiredModalHeight.value = finalHeight;
+ });
+ 
 
 onMounted(() => {
-  loadDesiredModalSize(); // Load saved size first
+  // Initial size loading is now handled by watchEffect
 
   if (props.connection) {
     nextTick(async () => {
@@ -317,9 +327,12 @@ const computedModalStyle = computed(() => {
   // const footerHeight = 35; // Defined in connectRdp
   // const extraHeight = headerHeight + footerHeight + 10; // Defined in connectRdp
 
+  // Apply minimum constraints here for the actual modal style
+  const actualWidth = Math.max(MIN_MODAL_WIDTH, desiredModalWidth.value);
+  const actualHeight = Math.max(MIN_MODAL_HEIGHT, desiredModalHeight.value);
   return {
-    width: `${desiredModalWidth.value}px`, // Width is direct
-    height: `${desiredModalHeight.value}px`, // Height is direct
+    width: `${actualWidth}px`,
+    height: `${actualHeight}px`,
   };
 });
 
@@ -380,8 +393,7 @@ const computedModalStyle = computed(() => {
             <input
               id="modal-width"
               type="number"
-              v-model="desiredModalWidth"
-              min="1024"
+              v-model.number="desiredModalWidth"
               step="10"
               class="w-16 px-1 py-0.5 text-xs border border-border rounded bg-input text-foreground focus:outline-none focus:ring-1 focus:ring-primary"
             />
@@ -389,8 +401,7 @@ const computedModalStyle = computed(() => {
             <input
               id="modal-height"
               type="number"
-              v-model="desiredModalHeight"
-              min="768"
+              v-model.number="desiredModalHeight"
               step="10"
               class="w-16 px-1 py-0.5 text-xs border border-border rounded bg-input text-foreground focus:outline-none focus:ring-1 focus:ring-primary"
             />
diff --git a/packages/frontend/src/stores/connections.store.ts b/packages/frontend/src/stores/connections.store.ts
index a942ff3..0a99607 100644
--- a/packages/frontend/src/stores/connections.store.ts
+++ b/packages/frontend/src/stores/connections.store.ts
@@ -41,7 +41,6 @@ export const useConnectionsStore = defineStore('connections', {
             try {
                 const cachedData = localStorage.getItem(cacheKey);
                 if (cachedData) {
-                    console.log('[ConnectionsStore] Loading connections from cache.');
                     this.connections = JSON.parse(cachedData);
                     this.isLoading = false; // 先显示缓存，设置为 false
                 } else {
@@ -57,21 +56,16 @@ export const useConnectionsStore = defineStore('connections', {
             // 2. 后台获取最新数据
             this.isLoading = true; // 标记正在后台获取
             try {
-                console.log('[ConnectionsStore] Fetching latest connections from server...');
                 const response = await apiClient.get<ConnectionInfo[]>('/connections');
                 const freshData = response.data;
-                console.log('[ConnectionsStore] Data received from API:', JSON.stringify(freshData, null, 2)); // Log received data
                 const freshDataString = JSON.stringify(freshData);
 
                 // 3. 对比并更新
                 const currentDataString = JSON.stringify(this.connections);
                 if (currentDataString !== freshDataString) {
-                    console.log('[ConnectionsStore] Connections data changed, updating state and cache.');
                     this.connections = freshData;
-                    console.log('[ConnectionsStore] State updated with fresh data:', JSON.stringify(this.connections, null, 2)); // Log state after update
                     localStorage.setItem(cacheKey, freshDataString); // 更新缓存
                 } else {
-                    console.log('[ConnectionsStore] Connections data is up-to-date.');
                 }
                 this.error = null; // 清除之前的错误（如果有）
             } catch (err: any) {
diff --git a/packages/frontend/src/stores/settings.store.ts b/packages/frontend/src/stores/settings.store.ts
index 26df9e6..7af27b7 100644
--- a/packages/frontend/src/stores/settings.store.ts
+++ b/packages/frontend/src/stores/settings.store.ts
@@ -45,6 +45,8 @@ interface SettingsState {
   fileManagerColWidths?: string; // NEW: 文件管理器列宽 JSON 字符串 (e.g., '{"name": 300, "size": 100}')
   commandInputSyncTarget?: 'quickCommands' | 'commandHistory' | 'none'; // NEW: 命令输入同步目标
   timezone?: string; // NEW: 时区设置 (e.g., 'Asia/Shanghai', 'UTC')
+  rdpModalWidth?: string; // NEW: RDP 模态框宽度
+  rdpModalHeight?: string; // NEW: RDP 模态框高度
   // Add other general settings keys here as needed
   [key: string]: string | undefined; // Allow other string settings
 }
@@ -211,6 +213,13 @@ export const useSettingsStore = defineStore('settings', () => {
       if (settings.value.timezone === undefined) {
           settings.value.timezone = 'UTC'; // 默认 UTC
       }
+      // NEW: RDP Modal Size defaults
+      if (settings.value.rdpModalWidth === undefined) {
+          settings.value.rdpModalWidth = '1064'; // 默认宽度 (1024 + 40 padding)
+      }
+      if (settings.value.rdpModalHeight === undefined) {
+          settings.value.rdpModalHeight = '858'; // 默认高度 (768 + chrome)
+      }
 
       // --- 语言设置 ---
       const langFromSettings = settings.value.language;
@@ -288,7 +297,9 @@ export const useSettingsStore = defineStore('settings', () => {
         'fileManagerRowSizeMultiplier', // +++ 添加文件管理器行大小键 +++
         'fileManagerColWidths', // +++ 添加文件管理器列宽键 +++
         'commandInputSyncTarget', // +++ 添加命令输入同步目标键 +++
-        'timezone' // NEW: 添加时区键
+        'timezone', // NEW: 添加时区键
+        'rdpModalWidth', // NEW: 添加 RDP 模态框宽度键
+        'rdpModalHeight' // NEW: 添加 RDP 模态框高度键
     ];
     if (!allowedKeys.includes(key)) {
         console.error(`[SettingsStore] 尝试更新不允许的设置键: ${key}`);
@@ -296,8 +307,12 @@ export const useSettingsStore = defineStore('settings', () => {
     }
 
     try {
+      console.log(`[SettingsStore] Attempting to update setting - Key: ${key}, Value: ${value}`); // +++ Add log +++
       // 注意：后端 controller 现在会过滤，但前端也做一层检查更好
-      await apiClient.put('/settings', { [key]: value }); // 使用 apiClient
+      const payload = { [key]: value };
+      console.log('[SettingsStore] Sending PUT request to /settings with payload:', payload); // +++ Add log +++
+      await apiClient.put('/settings', payload); // 使用 apiClient
+      console.log(`[SettingsStore] Successfully updated setting via API - Key: ${key}`); // +++ Add log +++
       // Update store state *after* successful API call
       settings.value = { ...settings.value, [key]: value };
 
@@ -309,8 +324,19 @@ export const useSettingsStore = defineStore('settings', () => {
         console.warn(`[SettingsStore] updateSetting: Attempted to set invalid language '${value}'. Ignoring i18n update.`);
       }
     } catch (err: any) {
-      console.error(`更新设置项 '${key}' 失败:`, err);
-      throw new Error(err.response?.data?.message || err.message || `更新设置项 '${key}' 失败`);
+      // +++ Enhanced error logging +++
+      console.error(`[SettingsStore] Failed to update setting '${key}' via API. Error:`, err);
+      if (err.response) {
+        console.error('[SettingsStore] API Error Response Data:', err.response.data);
+        console.error('[SettingsStore] API Error Response Status:', err.response.status);
+        console.error('[SettingsStore] API Error Response Headers:', err.response.headers);
+      } else if (err.request) {
+        console.error('[SettingsStore] API Error Request:', err.request);
+      } else {
+        console.error('[SettingsStore] API Error Message:', err.message);
+      }
+      // Rethrow the error but maybe provide a more specific message if possible
+      throw new Error(err.response?.data?.message || `更新设置项 '${key}' 失败: ${err.message}`);
     }
   }
 
@@ -330,7 +356,9 @@ export const useSettingsStore = defineStore('settings', () => {
         'fileManagerRowSizeMultiplier', // +++ 添加文件管理器行大小键 +++
         'fileManagerColWidths', // +++ 添加文件管理器列宽键 +++
         'commandInputSyncTarget', // +++ 添加命令输入同步目标键 +++
-        'timezone' // NEW: 添加时区键
+        'timezone', // NEW: 添加时区键
+        'rdpModalWidth', // NEW: 添加 RDP 模态框宽度键
+        'rdpModalHeight' // NEW: 添加 RDP 模态框高度键
     ];
     const filteredUpdates: Partial<SettingsState> = {};
     let languageUpdate: string | undefined = undefined; // Use string type