diff --git a/paddle/phi/kernels/gpu/ap_trivial_fusion_begin_kernel.cu b/paddle/phi/kernels/gpu/ap_trivial_fusion_begin_kernel.cu
index 117d587f6ed90b..68695013001b0b 100644
--- a/paddle/phi/kernels/gpu/ap_trivial_fusion_begin_kernel.cu
+++ b/paddle/phi/kernels/gpu/ap_trivial_fusion_begin_kernel.cu
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "paddle/phi/kernels/gpu/ap_trivial_fusion_begin_kernel.h"
 #include "paddle/common/enforce.h"
 #include "paddle/phi/backends/gpu/gpu_context.h"
 #include "paddle/phi/core/dense_tensor.h"
diff --git a/paddle/phi/kernels/gpu/ap_trivial_fusion_begin_kernel.h b/paddle/phi/kernels/gpu/ap_trivial_fusion_begin_kernel.h
new file mode 100644
index 00000000000000..9d045ef5981ff9
--- /dev/null
+++ b/paddle/phi/kernels/gpu/ap_trivial_fusion_begin_kernel.h
@@ -0,0 +1,28 @@
+// Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <vector>
+#include "paddle/phi/core/dense_tensor.h"
+
+namespace phi {
+
+template <typename T, typename Context>
+void ApTrivialFusionBeginKernel(
+    const Context& dev_ctx,
+    const paddle::optional<std::vector<const DenseTensor*>>& xs,
+    DenseTensor* out);
+
+}  // namespace phi