diff --git a/app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageBubble.kt b/app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageBubble.kt
index 38fafce..3359a57 100644
--- a/app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageBubble.kt
+++ b/app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageBubble.kt
@@ -52,19 +52,19 @@ fun MessageBubble(message: HistoryMessageDto) {
             .padding(horizontal = 14.dp),
         horizontalAlignment = if (isUser) Alignment.End else Alignment.Start,
     ) {
-        bubbles.forEachIndexed { index, bubble ->
+        // 来源角标放在消息组顶部，明确标注下面这一组气泡来自哪里
+        if (source != null) {
+            Text(
+                text = source,
+                style = MiuixTheme.textStyles.footnote2,
+                color = MiuixTheme.colorScheme.onSurfaceVariantSummary,
+                modifier = Modifier.padding(start = 6.dp, end = 6.dp),
+            )
+        }
+        bubbles.forEach { bubble ->
             AnnotationLine(bubble.head)
             if (bubble.body.isNotEmpty()) BubbleBody(bubble.body, isUser)
             AnnotationLine(bubble.tail)
-            // 来源角标只在最后一条气泡下方显示一次，避免多气泡消息重复刷屏
-            if (index == bubbles.lastIndex && source != null) {
-                Text(
-                    text = source,
-                    style = MiuixTheme.textStyles.footnote2,
-                    color = MiuixTheme.colorScheme.onSurfaceVariantSummary,
-                    modifier = Modifier.padding(top = 3.dp, start = 6.dp, end = 6.dp),
-                )
-            }
         }
     }
 }
diff --git a/app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageSource.kt b/app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageSource.kt
index 6a1c6fd..1a391e7 100644
--- a/app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageSource.kt
+++ b/app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageSource.kt
@@ -23,6 +23,8 @@ fun messageSourceLabel(message: HistoryMessageDto): String? {
             val browser = deviceId.removePrefix("web:").substringBefore(':')
             return "来自 Web($browser)"
         }
+        // IM 端 deviceId 形如 <平台名>:<配置id>:<uid>，只取平台名做友好显示
+        platformLabels[deviceId.substringBefore(':')]?.let { return "来自 $it" }
         return "来自 $deviceId"
     }