diff --git a/platform_web/components/ServerManagementTerminalDrawer.test.tsx b/platform_web/components/ServerManagementTerminalDrawer.test.tsx
index c45cacc..c33ac5d 100644
--- a/platform_web/components/ServerManagementTerminalDrawer.test.tsx
+++ b/platform_web/components/ServerManagementTerminalDrawer.test.tsx
@@ -111,7 +111,7 @@ describe("ServerManagementTerminalDrawer", () => {
     expect(apiMocks.dispatchSourceRCONCommand).not.toHaveBeenCalled();
   });
 
-  it("clears generation A on a new session and rejects late generation A events", async () => {
+  it("keeps visible output on a new session and rejects late generation A events", async () => {
     await renderDrawer();
     await emitSession("session-a");
     await emitStream(logStream("stdout-a", "session-a", "process.stdout"));
@@ -122,14 +122,14 @@ describe("ServerManagementTerminalDrawer", () => {
     await emitStream(logStream("stdout-b", "session-b", "process.stdout"));
     await emitLog("stdout-b", "session-b", "process.stdout", logEntry(1, "generation B output"));
 
-    expect(container?.textContent).not.toContain("generation A output");
+    expect(container?.textContent).toContain("generation A output");
     expect(container?.textContent).not.toContain("late generation A output");
     expect(container?.textContent).toContain("generation B output");
     expect(container?.textContent).toContain("Run 已切换到新的受管进程输出会话");
     expect(apiMocks.openServerLogEvents).toHaveBeenCalledTimes(1);
   });
 
-  it("clears a stopped session and restores the running session on the same SSE connection", async () => {
+  it("keeps visible output through a stopped boundary and restores the running session on the same SSE connection", async () => {
     await renderDrawer();
     await emitSession("session-a");
     await emitStream(logStream("stdout-a", "session-a", "process.stdout"));
@@ -137,14 +137,14 @@ describe("ServerManagementTerminalDrawer", () => {
 
     await emitSession();
     await emitLog("stdout-a", "session-a", "process.stdout", logEntry(2, "late output after stop"));
-    expect(container?.textContent).not.toContain("running output before stop");
+    expect(container?.textContent).toContain("running output before stop");
     expect(container?.textContent).not.toContain("late output after stop");
     expect(container?.textContent).toContain("当前没有可跟随的受管进程输出");
 
     await emitSession("session-b");
     await emitStream(logStream("stdout-b", "session-b", "process.stdout"));
     await emitLog("stdout-b", "session-b", "process.stdout", logEntry(1, "running output after recovery"));
-    expect(container?.textContent).not.toContain("running output before stop");
+    expect(container?.textContent).toContain("running output before stop");
     expect(container?.textContent).toContain("running output after recovery");
     expect(apiMocks.openServerLogEvents).toHaveBeenCalledTimes(1);
   });
diff --git a/platform_web/components/ServerManagementTerminalDrawer.tsx b/platform_web/components/ServerManagementTerminalDrawer.tsx
index adb1980..f709740 100644
--- a/platform_web/components/ServerManagementTerminalDrawer.tsx
+++ b/platform_web/components/ServerManagementTerminalDrawer.tsx
@@ -169,9 +169,10 @@ export function ServerManagementTerminalDrawer({ open, serverId, serverName, plu
       setLiveSessionId(nextSessionId);
       if (previousSessionId === nextSessionId) return;
       setStreams({ status: "ready", data: [] });
-      setLines(nextSessionId
-        ? [terminalSystemLine("info", previousSessionId === undefined ? "已跟随当前受管进程输出会话。" : "Run 已切换到新的受管进程输出会话。", "SYSTEM", `session-${nextSessionId}`, serverTimeRef.current)]
-        : [terminalSystemLine("warn", "当前没有可跟随的受管进程输出；旧日志可从历史查看。", "SYSTEM", "session-empty", serverTimeRef.current)]);
+      setLines((current) => mergeTerminalLines(current, [nextSessionId
+        ? terminalSystemLine("info", previousSessionId === undefined ? "已跟随当前受管进程输出会话。" : "Run 已切换到新的受管进程输出会话。", "SYSTEM", `session-${nextSessionId}`, serverTimeRef.current)
+        : terminalSystemLine("warn", "当前没有可跟随的受管进程输出；旧日志可从历史查看。", "SYSTEM", "session-empty", serverTimeRef.current)
+      ]));
       lockTerminalFollow();
     });
     events.addEventListener("stream", (event) => {