diff --git a/package.json b/package.json
index 8bbeece2..432486dd 100644
--- a/package.json
+++ b/package.json
@@ -35,6 +35,7 @@
     "image-conversion": "2.1.1",
     "js-cookie": "3.0.5",
     "jsencrypt": "3.5.4",
+    "mitt": "^3.0.1",
     "nprogress": "0.2.0",
     "pinia": "3.0.4",
     "screenfull": "6.0.2",
diff --git a/src/utils/sse.ts b/src/utils/sse.ts
index 059c8f82..dbd3b500 100644
--- a/src/utils/sse.ts
+++ b/src/utils/sse.ts
@@ -1,42 +1,102 @@
 import { getToken } from '@/utils/auth';
 import { ElNotification } from 'element-plus';
 import { useNoticeStore } from '@/store/modules/notice';
+import { getSseEventBus } from '@/utils/sseEventBus';
+
+/**
+ * Strongly-typed SSE envelope shared by every event:
+ *   { msgType: "...", data: { ...business fields... } }
+ * Frontend dispatches by msgType, then casts data to the corresponding shape.
+ */
+interface SseEnvelope<T = unknown> {
+  msgType: string;
+  data: T;
+}
+
+/** data shape under msgType in {LOGIN_WELCOME, WORKFLOW_TASK, SYSTEM_NOTICE} */
+interface NoticeData {
+  title: string;
+  message: string;
+}
+
+// Business-level SSE event names forwarded to the global event bus.
+// Feature modules subscribe via getSseEventBus().on('xxx', handler).
+const FORWARD_EVENTS = ['customerservice'];
+
+const MAX_RETRIES = 5;
+const RETRY_DELAY = 5000;
+
+let eventSource: EventSource | null = null;
+let retries = 0;
 
-// 初始化
 export const initSSE = (url: any) => {
   if (import.meta.env.VITE_APP_SSE === 'false') {
     return;
   }
+  connect(url);
+};
 
-  url = url + '?Authorization=Bearer ' + getToken() + '&clientid=' + import.meta.env.VITE_APP_CLIENT_ID;
-  const { data, error } = useEventSource(url, [], {
-    autoReconnect: {
-      retries: 5,
-      delay: 5000,
-      onFailed() {
-        console.log('Failed to connect after 5 retries');
-      }
+function parseEnvelope<T = unknown>(raw: string): SseEnvelope<T> | null {
+  try {
+    const env = JSON.parse(raw);
+    if (env && typeof env === 'object' && typeof env.msgType === 'string') {
+      return env as SseEnvelope<T>;
     }
-  });
+    console.warn('SSE: payload missing msgType', raw);
+    return null;
+  } catch (err) {
+    console.warn('SSE: invalid JSON envelope', raw, err);
+    return null;
+  }
+}
 
-  watch(error, () => {
-    console.log('SSE connection error:', error.value);
-    error.value = null;
-  });
+function connect(url: string) {
+  const fullUrl = url + '?Authorization=Bearer ' + getToken() + '&clientid=' + import.meta.env.VITE_APP_CLIENT_ID;
+  eventSource = new EventSource(fullUrl);
 
-  watch(data, () => {
-    if (!data.value) return;
+  // "notice" event: login welcome / workflow task / system announcement.
+  // All three share NoticeData shape; msgType differentiates the source.
+  eventSource.addEventListener('notice', (e: MessageEvent) => {
+    if (!e.data) return;
+    const env = parseEnvelope<NoticeData>(e.data);
+    if (!env) return;
+    const { title, message } = env.data;
     useNoticeStore().addNotice({
-      message: data.value,
+      title,
+      message,
       read: false,
       time: new Date().toLocaleString()
     });
     ElNotification({
-      title: '消息',
-      message: data.value,
+      title,
+      message,
       type: 'success',
       duration: 3000
     });
-    data.value = null;
   });
-};
+
+  // Business events: forward to global bus, feature modules subscribe themselves
+  const bus = getSseEventBus();
+  FORWARD_EVENTS.forEach((name) => {
+    eventSource!.addEventListener(name, (e: MessageEvent) => {
+      bus.emit(name, e.data);
+    });
+  });
+
+  eventSource.onopen = () => {
+    retries = 0;
+    console.log('SSE connected');
+  };
+
+  eventSource.onerror = (err) => {
+    console.log('SSE connection error:', err);
+    eventSource?.close();
+    eventSource = null;
+    if (retries < MAX_RETRIES) {
+      retries += 1;
+      setTimeout(() => connect(url), RETRY_DELAY);
+    } else {
+      console.log('SSE failed after', MAX_RETRIES, 'retries');
+    }
+  };
+}
diff --git a/src/utils/sseEventBus.ts b/src/utils/sseEventBus.ts
new file mode 100644
index 00000000..9fea3314
--- /dev/null
+++ b/src/utils/sseEventBus.ts
@@ -0,0 +1,21 @@
+import mitt, { Emitter } from 'mitt';
+
+/**
+ * SSE event bus events shape: protocol-level event name -> raw data string
+ * Consumers JSON.parse the payload themselves
+ */
+export type SseBusEvents = Record<string, string>;
+
+let bus: Emitter<SseBusEvents> | null = null;
+
+/**
+ * Lazily-initialized singleton event bus
+ * Used by sse.ts to forward business event names (e.g. "customerservice")
+ * to feature modules without creating a second EventSource
+ */
+export function getSseEventBus(): Emitter<SseBusEvents> {
+  if (!bus) {
+    bus = mitt<SseBusEvents>();
+  }
+  return bus;
+}