diff --git a/src/Nncase.Passes/Rules/ShapeBucket/ShapeBucketHelper.cs b/src/Nncase.Passes/Rules/ShapeBucket/ShapeBucketHelper.cs
index 8bfe31acb..005c7850f 100644
--- a/src/Nncase.Passes/Rules/ShapeBucket/ShapeBucketHelper.cs
+++ b/src/Nncase.Passes/Rules/ShapeBucket/ShapeBucketHelper.cs
@@ -335,10 +335,10 @@ public static void ArgsChecker(Expr[] newArgs)
             throw new InvalidOperationException("Args has tuple");
         }
 
-        if (newArgs.ToHashSet().Count != newArgs.Length)
-        {
-            throw new InvalidOperationException("Has Repeat args");
-        }
+        // if (newArgs.ToHashSet().Count != newArgs.Length)
+        // {
+        //     throw new InvalidOperationException("Has Repeat args");
+        // }
     }
 
     // clone origin Expr and Do replace for var
diff --git a/src/Nncase.Passes/Rules/ShapeBucket/SplitLLMStage.cs b/src/Nncase.Passes/Rules/ShapeBucket/SplitLLMStage.cs
index 2d2bce5b2..723915c69 100644
--- a/src/Nncase.Passes/Rules/ShapeBucket/SplitLLMStage.cs
+++ b/src/Nncase.Passes/Rules/ShapeBucket/SplitLLMStage.cs
@@ -41,9 +41,26 @@ protected override async Task<IRModule> RunCoreAsync(IRModule input, RunPassCont
             input.Add(decode);
             Expr newBody;
             {
-                var kvShape = IR.F.Tensors.ShapeOf(entry.Parameters[3]); // %past_key_values: f32[24,2,1,?,2,64]
-                var kvLen = IR.F.Tensors.GetItem(kvShape, 3);
-                var cond = IR.F.Math.Equal(kvLen, 0L);
+                Expr? history_len = null;
+                for (int j = 0; j < entry.Parameters.Length; j++)
+                {
+                    var paramVar = entry.Parameters[j];
+                    var dimExprs = CompileOptions.ShapeBucketOptions.VarMap[paramVar];
+                    for (int i = 0; i < dimExprs.Length; i++)
+                    {
+                        if (dimExprs[i] is Var { Name: "history_len" } && history_len is null)
+                        {
+                            history_len = IR.F.Tensors.GetItem(IR.F.Tensors.ShapeOf(paramVar), i);
+                        }
+                    }
+                }
+
+                if (history_len is null)
+                {
+                    throw new NotSupportedException("Can't get the history len from the function inputs!");
+                }
+
+                var cond = IR.F.Math.Equal(history_len, 0L);
                 newBody = new IR.If(cond, prefill, decode, entry.Parameters.ToArray());
             }