diff --git a/src/fpga/api.h b/src/fpga/api.h
index 0823e19a7f9dfaba709b6ad2723e3228c27e2e0f..73db2bfbdac50c123bb0204ff63d4412a2dadfe7 100644
--- a/src/fpga/api.h
+++ b/src/fpga/api.h
@@ -174,5 +174,7 @@ int ComputeFpgaConv(const struct ConvArgs& args);
 int ComputeFpgaPool(const struct PoolingArgs& args);
 int ComputeFpgaEWAdd(const struct EWAddArgs& args);
 
+static inline int align_to_x(int num, int x) { return (num + x - 1) / x * x; }
+
 }  // namespace fpga
 }  // namespace paddle_mobile
diff --git a/src/fpga/bias_scale.cpp b/src/fpga/bias_scale.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..51c4a0ac73869c974332f37c7bae8186c28e63c3
--- /dev/null
+++ b/src/fpga/bias_scale.cpp
@@ -0,0 +1,65 @@
+/* Copyright (c) 2018 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. */
+
+#include "bias_scale.h"
+#include <memory.h>
+#include "api.h"
+
+namespace paddle_mobile {
+namespace fpga {
+namespace bias_scale {
+
+void align_element(float **data_in, int num_per_div_before_alignment, int num) {
+  float *ptr_unaligned = *data_in;
+  int div_num =
+      (num + num_per_div_before_alignment - 1) / num_per_div_before_alignment;
+  int num_per_div_after_alignment =
+      align_to_x(num_per_div_before_alignment, BS_NUM_ALIGNMENT);
+  int num_element =
+      2 * div_num * num_per_div_after_alignment;  // including bias & scale
+  float *ptr_aligned = (float *)fpga_malloc(num_element * sizeof(float));
+
+  memset(ptr_aligned, 0, num_element * sizeof(float));
+
+  for (int i = 0; i < div_num; i++) {
+    memcpy(ptr_aligned + i * num_per_div_after_alignment, ptr_unaligned,
+           num_per_div_before_alignment * sizeof(float));
+  }
+
+  fpga_free(ptr_unaligned);
+  *data_in = ptr_aligned;
+}
+
+void interleave(float **data_in, int num_after_alignment) {
+  // num_after_alignment: number of bias after alignment
+
+  float *ptr_uninterleaved = *data_in;
+  float *ptr_interleaved =
+      (float *)fpga_malloc(2 * num_after_alignment * sizeof(float));
+  int num = num_after_alignment / 4;
+  for (int i = 0; i < num; i++) {
+    memcpy(ptr_interleaved + 8 * i, ptr_uninterleaved + 4 * i,
+           4 * sizeof(float));
+    memcpy(ptr_interleaved + 8 * i + 4,
+           ptr_uninterleaved + num_after_alignment * sizeof(float) + 4 * i,
+           4 * sizeof(float));
+  }
+
+  fpga_free(ptr_uninterleaved);
+  *data_in = ptr_interleaved;
+}
+
+}  // namespace bias_scale
+}  // namespace fpga
+}  // namespace paddle_mobile
diff --git a/src/fpga/bias_scale.h b/src/fpga/bias_scale.h
new file mode 100644
index 0000000000000000000000000000000000000000..ff56d4bcae374424b1fc1eabf59f4f0015256c7c
--- /dev/null
+++ b/src/fpga/bias_scale.h
@@ -0,0 +1,28 @@
+/* Copyright (c) 2018 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
+
+#define BS_NUM_ALIGNMENT 8
+
+namespace paddle_mobile {
+namespace fpga {
+namespace bias_scale {
+
+void align_element(float** data_in, int num_per_div_before_alignment, int num);
+void interleave(float** data_in, int num_after_alignment);
+
+}  // namespace bias_scale
+}  // namespace fpga
+}  // namespace paddle_mobile
diff --git a/src/fpga/filter.cpp b/src/fpga/filter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c71d75ca9b4383287e36e783ce8d3bc6760752cd
--- /dev/null
+++ b/src/fpga/filter.cpp
@@ -0,0 +1,40 @@
+/* Copyright (c) 2018 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. */
+#include "filter.h"
+#include <memory.h>
+#include "api.h"
+
+namespace paddle_mobile {
+namespace fpga {
+namespace filter {
+
+void convert_to_hwc(float** data_in, int num, int channel, int height,
+                    int width) {}
+
+float find_max(float* data_in, int num) { return 0; }
+
+void quantize(float* data_in, int num) {}
+
+void align_element(float** data_in, int num, int chw) {}
+
+void align_num(float** data_in, int num_per_div_before_alignment, int num,
+               int chw) {}
+
+void reorder(float** data_in, int num_after_alignment, int chw) {}
+
+void interleave(float** data_in, int num_after_alignment, int chw) {}
+
+}  // namespace filter
+}  // namespace fpga
+}  // namespace paddle_mobile
diff --git a/src/fpga/filter.h b/src/fpga/filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..1936c225e10ae3e7cfdb673de14fdce791fe8d69
--- /dev/null
+++ b/src/fpga/filter.h
@@ -0,0 +1,35 @@
+/* Copyright (c) 2018 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
+
+#define FILTER_NUM_ALIGNMENT 32      // Filter number aligned to 32
+#define FILTER_ELEMENT_ALIGNMENT 16  // Filter element number aligned to 16
+
+namespace paddle_mobile {
+namespace fpga {
+namespace filter {
+void convert_to_hwc(float** data_in, int num, int channel, int height,
+                    int width);
+float find_max(float* data_in, int num);
+void quantize(float* data_in, int num);
+void align_element(float** data_in, int num, int chw);
+void align_num(float** data_in, int num_per_div_before_alignment, int num,
+               int chw);
+void reorder(float** data_in, int num_after_alignment, int chw);
+void interleave(float** data_in, int num_after_alignment, int chw);
+
+}  // namespace filter
+}  // namespace fpga
+}  // namespace paddle_mobile
diff --git a/src/fpga/image.cpp b/src/fpga/image.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6bbf34eae933d69d00517c723326111901444ab0
--- /dev/null
+++ b/src/fpga/image.cpp
@@ -0,0 +1,13 @@
+/* Copyright (c) 2018 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. */
diff --git a/src/fpga/image.h b/src/fpga/image.h
new file mode 100644
index 0000000000000000000000000000000000000000..6bbf34eae933d69d00517c723326111901444ab0
--- /dev/null
+++ b/src/fpga/image.h
@@ -0,0 +1,13 @@
+/* Copyright (c) 2018 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. */