diff --git a/static/js/app.js b/static/js/app.js
index a1dc1d8..a09381b 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -19,6 +19,7 @@ const STATUS_LABEL = {
 let currentTestId = null;   // 正在跑的测试 id
 let pollTimer = null;
 let lastLogId = 0;
+let polling = false;        // 防止轮询请求重叠：上一请求未返回前不再发，避免同批日志被追加两次
 let consoleLogs = [];       // 当前测试已加载日志 [{id,level,msg,rel}]
 
 // 上下文长度：chips 列表 + 启用集合（默认 512/2048/4096/8192/16384/32768/65536/131072）
@@ -326,6 +327,7 @@ function appendLogs(logs) {
     html += `<div class="ln ${esc(l.level)}"><span class="ts">[${l.rel.toFixed(3)}s]</span> ${esc(l.msg)}</div>`;
   }
   box.insertAdjacentHTML("beforeend", html);
+  consoleLogs.push(...logs);  // 记录已加载日志，修正“日志条数”一直显示 0 条的问题
   $("#log-count").textContent = `${consoleLogs.length} 条`;
   if (atBottom) box.scrollTop = box.scrollHeight;
 }
@@ -386,7 +388,8 @@ function startTest() {
 }
 
 async function pollLogs() {
-  if (currentTestId == null) return;
+  if (currentTestId == null || polling) return;
+  polling = true;
   try {
     const d = await api(`/api/tests/${currentTestId}/logs?after=${lastLogId}`);
     if (d.logs && d.logs.length) {
@@ -399,6 +402,8 @@ async function pollLogs() {
     }
   } catch (e) {
     /* 网络抖动忽略 */
+  } finally {
+    polling = false;
   }
 }
 
diff --git a/tester.py b/tester.py
index e34eab1..82bb06c 100644
--- a/tester.py
+++ b/tester.py
@@ -86,6 +86,7 @@ class TestRunner(threading.Thread):
         self.log("INFO", "校准完成: %.3f tok/字符（%.2f 字符/token）" % (ratio, 1.0 / ratio))
 
         run_seq = 0
+        last_conc = None  # 只在实际切换并发档时打印一次表头，避免同一并发数重复刷屏
         for L in lengths:
             if self.should_stop():
                 raise StopRequested()
@@ -94,7 +95,9 @@ class TestRunner(threading.Thread):
             for C in concurrency_levels:
                 if self.should_stop():
                     raise StopRequested()
-                self.log("INFO", "══ 并发数 %d（同时 %d 个流）══" % (C, C))
+                if C != last_conc:
+                    self.log("INFO", "══ 并发数 %d（同时 %d 个流）══" % (C, C))
+                    last_conc = C
                 if warmup:
                     self._warmup(base_prompt, C)
                 for i in range(1, n + 1):