diff --git a/src/config.ts b/src/config.ts
index d6cafca..2a63427 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -7,6 +7,7 @@ export interface DiscourseSyncSettings {
 	category: number;
 	skipH1: boolean;
 	userApiKey: string;
+	lastNotifiedVersion?: string; // 记录上次显示更新通知的版本
 }
 
 export const DEFAULT_SETTINGS: DiscourseSyncSettings = {
diff --git a/src/i18n/en.ts b/src/i18n/en.ts
index 79954db..fbab349 100644
--- a/src/i18n/en.ts
+++ b/src/i18n/en.ts
@@ -86,5 +86,11 @@ export default {
     'USER_API_KEY_DESC': 'Current configured User-API-Key (read-only)',
     'USER_API_KEY_EMPTY': 'Please use the process below to obtain one',
     'COPY_API_KEY': 'Copy',
-    'API_KEY_COPIED': '✅ API Key copied to clipboard'
+    'API_KEY_COPIED': '✅ API Key copied to clipboard',
+
+    // Version update notice
+    'UPDATE_NOTICE_TITLE': '🔄 Plugin Updated - Reconfiguration Required',
+    'UPDATE_NOTICE_MESSAGE': 'Due to major changes in authentication method, you need to reconfigure your User-API-Key. The old API Key and username method has been removed. Please go to settings to reconfigure.',
+    'UPDATE_NOTICE_BUTTON': 'Go to Settings',
+    'UPDATE_NOTICE_DISMISS': 'I understand'
 } 
\ No newline at end of file
diff --git a/src/i18n/zh-CN.ts b/src/i18n/zh-CN.ts
index 7d53caa..34b6d66 100644
--- a/src/i18n/zh-CN.ts
+++ b/src/i18n/zh-CN.ts
@@ -86,5 +86,11 @@ export default {
     'USER_API_KEY_DESC': '当前配置的 User-API-Key（只读）',
     'USER_API_KEY_EMPTY': '请使用下面的流程获取',
     'COPY_API_KEY': '复制',
-    'API_KEY_COPIED': '✅ API Key 已复制到剪贴板'
+    'API_KEY_COPIED': '✅ API Key 已复制到剪贴板',
+
+    // 版本更新提示
+    'UPDATE_NOTICE_TITLE': '🔄 插件已更新 - 需要重新配置',
+    'UPDATE_NOTICE_MESSAGE': '由于认证方式的重大变化，您需要重新配置 User-API-Key。旧的 API Key 和用户名方式已被移除，请前往设置页面重新配置。',
+    'UPDATE_NOTICE_BUTTON': '前往设置',
+    'UPDATE_NOTICE_DISMISS': '我知道了'
 } 
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index 8e78e10..85e07c6 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -5,7 +5,7 @@ import { t, setLocale } from './i18n';
 import { expandEmbeds } from './expand-embeds';
 import { DiscourseAPI } from './api';
 import { EmbedHandler } from './embed-handler';
-import { SelectCategoryModal, CategoryConflictModal } from './ui';
+import { SelectCategoryModal, CategoryConflictModal, UpdateNoticeModal } from './ui';
 import { NotifyUser } from './notification';
 import { getFrontMatter, removeFrontMatter } from './utils';
 import { ActiveFile, PluginInterface } from './types';
@@ -30,6 +30,9 @@ export default class PublishToDiscourse extends Plugin implements PluginInterfac
 		// 加载设置
 		await this.loadSettings();
 		
+		// 检查是否需要显示更新通知
+		await this.checkForUpdateNotice();
+		
 		// 初始化API和嵌入处理器
 		this.api = new DiscourseAPI(this.app, this.settings);
 		this.embedHandler = new EmbedHandler(this.app, this.api);
@@ -71,6 +74,29 @@ export default class PublishToDiscourse extends Plugin implements PluginInterfac
 		await this.saveData(this.settings);
 	}
 
+	// 检查是否需要显示更新通知
+	private async checkForUpdateNotice() {
+		const currentVersion = this.manifest.version;
+		const lastNotifiedVersion = this.settings.lastNotifiedVersion;
+		
+		// 如果是首次运行当前版本，显示更新通知
+		if (lastNotifiedVersion !== currentVersion) {
+			// 延迟显示，确保界面已完全加载
+			setTimeout(() => {
+				const modal = new UpdateNoticeModal(this.app, this, () => {
+					// 打开设置页面
+					(this.app as any).setting.open();
+					(this.app as any).setting.openTabById(this.manifest.id);
+				});
+				modal.open();
+			}, 1000);
+			
+			// 更新记录的版本
+			this.settings.lastNotifiedVersion = currentVersion;
+			await this.saveSettings();
+		}
+	}
+
 	// 注册目录菜单
 	registerDirMenu(menu: Menu, file: TFile) {
 		const syncDiscourse = (item: MenuItem) => {
diff --git a/src/ui.ts b/src/ui.ts
index ddbf8d5..116a58d 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -344,4 +344,60 @@ export class CategoryConflictModal extends Modal {
             this.resolve(false);
         }
     }
+}
+
+// 版本更新通知模态框
+export class UpdateNoticeModal extends Modal {
+    plugin: PluginInterface;
+    onSettingsClick: () => void;
+
+    constructor(app: App, plugin: PluginInterface, onSettingsClick: () => void) {
+        super(app);
+        this.plugin = plugin;
+        this.onSettingsClick = onSettingsClick;
+    }
+
+    onOpen() {
+        const { contentEl } = this;
+        contentEl.empty();
+        contentEl.addClass('discourse-update-notice-modal');
+
+        // 标题
+        contentEl.createEl('h2', { 
+            text: t('UPDATE_NOTICE_TITLE'),
+            cls: 'update-notice-title'
+        });
+
+        // 消息内容
+        const messageEl = contentEl.createEl('div', { 
+            cls: 'update-notice-message'
+        });
+        messageEl.createEl('p', { text: t('UPDATE_NOTICE_MESSAGE') });
+
+        // 按钮区域
+        const buttonArea = contentEl.createEl('div', { cls: 'update-notice-buttons' });
+        
+        // 前往设置按钮
+        const settingsButton = buttonArea.createEl('button', {
+            cls: 'mod-cta',
+            text: t('UPDATE_NOTICE_BUTTON')
+        });
+        settingsButton.onclick = () => {
+            this.close();
+            this.onSettingsClick();
+        };
+
+        // 我知道了按钮
+        const dismissButton = buttonArea.createEl('button', {
+            text: t('UPDATE_NOTICE_DISMISS')
+        });
+        dismissButton.onclick = () => {
+            this.close();
+        };
+    }
+
+    onClose() {
+        const { contentEl } = this;
+        contentEl.empty();
+    }
 } 
\ No newline at end of file
diff --git a/styles.css b/styles.css
index e5458d4..0f564ff 100644
--- a/styles.css
+++ b/styles.css
@@ -483,3 +483,67 @@ If your plugin does not need CSS, delete this file.
     max-width: none;
   }
 }
+
+/* Update Notice Modal Styles */
+.discourse-update-notice-modal {
+  padding: var(--size-4-4);
+  max-width: 500px;
+  background-color: var(--background-primary);
+  border-radius: var(--radius-l);
+}
+
+.discourse-update-notice-modal .update-notice-title {
+  margin: 0 0 var(--size-2-3) 0;
+  font-size: var(--font-text-size);
+  font-weight: var(--font-weight-bold);
+  color: var(--text-accent);
+  text-align: center;
+}
+
+.discourse-update-notice-modal .update-notice-message {
+  margin-bottom: var(--size-4-4);
+  text-align: left;
+}
+
+.discourse-update-notice-modal .update-notice-message p {
+  margin: 0;
+  color: var(--text-normal);
+  line-height: var(--line-height-normal);
+  font-size: var(--font-ui-medium);
+}
+
+.discourse-update-notice-modal .update-notice-buttons {
+  display: flex;
+  gap: var(--size-2-3);
+  justify-content: center;
+}
+
+.discourse-update-notice-modal .update-notice-buttons button {
+  flex: 1;
+  max-width: 150px;
+  padding: var(--size-2-2) var(--size-2-4);
+  border-radius: var(--radius-m);
+  cursor: pointer;
+  font-weight: var(--font-weight-medium);
+  font-size: var(--font-ui-medium);
+  transition: all 0.2s ease;
+  min-height: 36px;
+  border: 1px solid var(--background-modifier-border);
+  background-color: var(--background-secondary);
+  color: var(--text-normal);
+}
+
+.discourse-update-notice-modal .update-notice-buttons button:hover {
+  background-color: var(--background-modifier-hover);
+}
+
+.discourse-update-notice-modal .update-notice-buttons button.mod-cta {
+  background-color: var(--interactive-accent);
+  color: var(--text-on-accent);
+  border-color: var(--interactive-accent);
+}
+
+.discourse-update-notice-modal .update-notice-buttons button.mod-cta:hover {
+  background-color: var(--interactive-accent-hover);
+  border-color: var(--interactive-accent-hover);
+}