diff --git a/edc-web/app/__pycache__/config.cpython-311.pyc b/edc-web/app/__pycache__/config.cpython-311.pyc
index caade31..d635b3c 100644
Binary files a/edc-web/app/__pycache__/config.cpython-311.pyc and b/edc-web/app/__pycache__/config.cpython-311.pyc differ
diff --git a/edc-web/app/models.py b/edc-web/app/models.py
index 62c5eb9..cd008a4 100644
--- a/edc-web/app/models.py
+++ b/edc-web/app/models.py
@@ -108,6 +108,17 @@ def get_serialnet_records(dnt_id: int, limit: int = 50) -> list[dict]:
         conn.close()
 
 
+def clear_serialnet_records(dnt_id: int):
+    """清除指定设备的所有透传记录"""
+    conn = get_conn()
+    try:
+        with conn.cursor() as cur:
+            cur.execute("DELETE FROM tb_serialnet WHERE dnt_id=%s", (dnt_id,))
+        conn.commit()
+    finally:
+        conn.close()
+
+
 # ─── tb_state_tst ──────────────────────────────────────────────────
 
 def get_latest_test_state(dnt_id: int) -> dict | None:
diff --git a/edc-web/app/routes/test_op.py b/edc-web/app/routes/test_op.py
index 911cfbf..91a29f2 100644
--- a/edc-web/app/routes/test_op.py
+++ b/edc-web/app/routes/test_op.py
@@ -8,6 +8,7 @@ from app.models import (
     get_serialnet_stats,
     get_latest_test_state,
     get_automation_averages,
+    clear_serialnet_records,
 )
 
 bp = Blueprint("test_op", __name__)
@@ -54,7 +55,8 @@ def api_automation_start():
     dnt_id = data.get("dnt_id")
     count = int(data.get("count", 1))
 
-    # 插入第一条 0xB0 指令
+    # 清除旧记录，然后插入第一条 0xB0
+    clear_serialnet_records(dnt_id)
     record_id = insert_serialnet(dnt_id, COMMANDS["B0"])
     return jsonify({
         "ok": True,
diff --git a/edc-web/app/static/js/test_op.js b/edc-web/app/static/js/test_op.js
index 6da7a7c..6590701 100644
--- a/edc-web/app/static/js/test_op.js
+++ b/edc-web/app/static/js/test_op.js
@@ -48,9 +48,14 @@ async function startAuto() {
     autoFailed = 0;
     autoRemaining = count;
 
-    // 清空平均值显示
+    // 清空显示
     resetAverages();
-    updateUI();
+    document.getElementById("latest-result").innerHTML = '<p class="placeholder">等待测试...</p>';
+    document.getElementById("progress-bar").style.width = "0%";
+    document.getElementById("progress-text").textContent = "0/" + count + " (0 失败)";
+    document.getElementById("stat-done").textContent = "0";
+    document.getElementById("stat-failed").textContent = "0";
+    document.getElementById("stat-remaining").textContent = count;
 
     const btn = document.getElementById("btn-auto");
     btn.textContent = "结束";