diff --git a/ConeCalorimeter/ViewModels/CValueCalibrationViewModel.cs b/ConeCalorimeter/ViewModels/CValueCalibrationViewModel.cs
index feda720..4ce328d 100644
--- a/ConeCalorimeter/ViewModels/CValueCalibrationViewModel.cs
+++ b/ConeCalorimeter/ViewModels/CValueCalibrationViewModel.cs
@@ -688,9 +688,12 @@ public sealed class CValueCalibrationViewModel : PageViewModel
         CValueCalibrationActionViewModel actionViewModel)
     {
         var calibrationDataStatus = RefreshDeviceValues();
+        var shutdownSummary = action == CalibrationStartAction
+            ? CloseCalibrationActuatorsAfterCompletion()
+            : string.Empty;
         LastAction = action == CalibrationStartAction && !calibrationDataStatus.HasAllValues
-            ? $"{waitState.CompletedText}，{calibrationDataStatus.MissingSummary}"
-            : waitState.CompletedText;
+            ? AppendActionSummary(waitState.CompletedText, calibrationDataStatus.MissingSummary, shutdownSummary)
+            : AppendActionSummary(waitState.CompletedText, shutdownSummary);
         waitState.End();
 
         try
@@ -703,6 +706,50 @@ public sealed class CValueCalibrationViewModel : PageViewModel
         }
     }
 
+    private string CloseCalibrationActuatorsAfterCompletion()
+    {
+        var failedActions = new List<string>(2);
+
+        CloseHoldActionAfterCompletion(MethaneValveAction, MethaneValveCoil, failedActions);
+        CloseHoldActionAfterCompletion(SamplingPumpAction, SamplingPumpCoil, failedActions);
+
+        return failedActions.Count == 0
+            ? "已关闭甲烷阀和取样泵"
+            : $"{string.Join("、", failedActions)}关闭失败";
+    }
+
+    private void CloseHoldActionAfterCompletion(
+        string action,
+        ushort coilAddress,
+        List<string> failedActions)
+    {
+        if (_tcpDeviceConnectionService.TryWriteCoil(coilAddress, false))
+        {
+            if (!UpdateActionStatus(action, coilAddress) && _actionsByLabel.TryGetValue(action, out var actionViewModel))
+            {
+                actionViewModel.UpdateStatus(false);
+            }
+
+            return;
+        }
+
+        failedActions.Add(action);
+        Debug.WriteLine($"C value calibration action '{action}' auto close failed after calibration completion.");
+    }
+
+    private static string AppendActionSummary(string message, params string[] summaries)
+    {
+        foreach (var summary in summaries)
+        {
+            if (!string.IsNullOrWhiteSpace(summary))
+            {
+                message = $"{message}，{summary}";
+            }
+        }
+
+        return message;
+    }
+
     private bool TryStartCoilPulse(ushort coilAddress, string actionText)
     {
         if (!_tcpDeviceConnectionService.TryWriteCoil(coilAddress, true))