diff --git a/SicRT/Equipments/AutoTransfer.cs b/SicRT/Equipments/AutoTransfer.cs
index b076be4..a8ef5f5 100644
--- a/SicRT/Equipments/AutoTransfer.cs
+++ b/SicRT/Equipments/AutoTransfer.cs
@@ -52,6 +52,8 @@ namespace SicRT.Modules
         private double _timeBuffer3 { get; set; }
         private double _timeLoad { get; set; }
 
+        private const int _bufferFloors = 1;
+
         private Dictionary<string, DateTime> _loadWaferInfo = new();
 
         private Dictionary<string, DateTime> _bufferWaferInfo = new();
@@ -1151,7 +1153,7 @@ namespace SicRT.Modules
                 return;
             }
 
-            for (var i = 0; i < 3; i++)
+            for (var i = 0; i < _bufferFloors; i++)
             {
                 var canExcute = _buffer.HasWafer(i) && _buffer.CheckWaferNextStepIsThis(_buffer.Module, i);
                 if (canExcute)
@@ -2131,7 +2133,7 @@ namespace SicRT.Modules
                     waferCount++;
                 }
             }
-            for (var i = 0; i < 3; i++)
+            for (var i = 0; i < _bufferFloors; i++)
             {
                 if (_buffer.HasWafer(i))
                 {
@@ -2155,7 +2157,7 @@ namespace SicRT.Modules
                 waferCount++;
             }
 
-            for (var i = 0; i < 3; i++)
+            for (var i = 0; i < _bufferFloors; i++)
             {
                 if (_buffer.HasWafer(i) && (_buffer.CheckWaferNeedProcess(i, processIn) || _buffer.GetWaferInfo(i).SubstHists.Select(x => x.locationID).Contains(processIn.ToString())))
                 {
@@ -2186,7 +2188,7 @@ namespace SicRT.Modules
                 }
             }
 
-            for (var i = 0; i < 3; i++)
+            for (var i = 0; i < _bufferFloors; i++)
             {
                 if (_buffer.HasTray(i))
                 {