diff --git a/app/src/main/kotlin/top/yeij/cyrene/ui/chat/ChatScreen.kt b/app/src/main/kotlin/top/yeij/cyrene/ui/chat/ChatScreen.kt
index 7f4bec4..47de3f3 100644
--- a/app/src/main/kotlin/top/yeij/cyrene/ui/chat/ChatScreen.kt
+++ b/app/src/main/kotlin/top/yeij/cyrene/ui/chat/ChatScreen.kt
@@ -18,6 +18,9 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -40,6 +43,9 @@ import top.yukonga.miuix.kmp.icon.MiuixIcons
 import top.yukonga.miuix.kmp.icon.basic.Sidebar
 import top.yukonga.miuix.kmp.theme.MiuixTheme
 
+/** 判定「贴着底部」的容差（px）。 */
+private const val BOTTOM_TOLERANCE = 64
+
 @Composable
 fun ChatScreen(
     container: AppContainer,
@@ -52,6 +58,28 @@ fun ChatScreen(
     val state by viewModel.state.collectAsState()
     val listState = rememberLazyListState()
 
+    // 是否跟随底部（微信/QQ 式）：只有用户主动滚到别处时才停止跟随。
+    // 只在「滚动结束」时更新，避免新消息插入导致的锚点位移把状态带偏。
+    var followBottom by remember { mutableStateOf(true) }
+    LaunchedEffect(listState) {
+        snapshotFlow { listState.isScrollInProgress }
+            .distinctUntilChanged()
+            .collect { scrolling ->
+                if (!scrolling) {
+                    followBottom = listState.firstVisibleItemIndex == 0 &&
+                        listState.firstVisibleItemScrollOffset < BOTTOM_TOLERANCE
+                }
+            }
+    }
+
+    // 最新一项变化（新消息 / 乐观气泡 / 流式气泡 / 落库归一）时，跟随则滚到底。
+    val newestKey = state.items.lastOrNull()?.key
+    LaunchedEffect(newestKey) {
+        if (newestKey != null && followBottom) {
+            listState.animateScrollToItem(0)
+        }
+    }
+
     // reverseLayout 下「列表末尾」就是屏幕顶部；接近末尾时加载更早的一页。
     LaunchedEffect(listState) {
         snapshotFlow {