diff --git a/python/paddle/fluid/tests/unittests/dygraph_to_static/darknet.py b/python/paddle/fluid/tests/unittests/dygraph_to_static/darknet.py
new file mode 100644
index 0000000000000000000000000000000000000000..cdf478f87107ae96e4638e0b4b168fbf0f042eb1
--- /dev/null
+++ b/python/paddle/fluid/tests/unittests/dygraph_to_static/darknet.py
@@ -0,0 +1,184 @@
+#  Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
+#
+#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.
+
+import paddle.fluid as fluid
+from paddle.fluid.param_attr import ParamAttr
+from paddle.fluid.regularizer import L2Decay
+
+from paddle.fluid.dygraph.nn import Conv2D, BatchNorm
+from paddle.fluid.dygraph.base import to_variable
+
+
+class ConvBNLayer(fluid.dygraph.Layer):
+    def __init__(self,
+                 ch_in,
+                 ch_out,
+                 filter_size=3,
+                 stride=1,
+                 groups=1,
+                 padding=0,
+                 act="leaky",
+                 is_test=True):
+        super(ConvBNLayer, self).__init__()
+
+        self.conv = Conv2D(
+            num_channels=ch_in,
+            num_filters=ch_out,
+            filter_size=filter_size,
+            stride=stride,
+            padding=padding,
+            groups=groups,
+            param_attr=ParamAttr(
+                initializer=fluid.initializer.Normal(0., 0.02)),
+            bias_attr=False,
+            act=None)
+        self.batch_norm = BatchNorm(
+            num_channels=ch_out,
+            is_test=is_test,
+            param_attr=ParamAttr(
+                initializer=fluid.initializer.Normal(0., 0.02),
+                regularizer=L2Decay(0.)),
+            bias_attr=ParamAttr(
+                initializer=fluid.initializer.Constant(0.0),
+                regularizer=L2Decay(0.)))
+
+        self.act = act
+
+    def forward(self, inputs):
+        out = self.conv(inputs)
+        out = self.batch_norm(out)
+        if self.act == 'leaky':
+            out = fluid.layers.leaky_relu(x=out, alpha=0.1)
+        return out
+
+
+class DownSample(fluid.dygraph.Layer):
+    def __init__(self,
+                 ch_in,
+                 ch_out,
+                 filter_size=3,
+                 stride=2,
+                 padding=1,
+                 is_test=True):
+
+        super(DownSample, self).__init__()
+
+        self.conv_bn_layer = ConvBNLayer(
+            ch_in=ch_in,
+            ch_out=ch_out,
+            filter_size=filter_size,
+            stride=stride,
+            padding=padding,
+            is_test=is_test)
+        self.ch_out = ch_out
+
+    def forward(self, inputs):
+        out = self.conv_bn_layer(inputs)
+        return out
+
+
+class BasicBlock(fluid.dygraph.Layer):
+    def __init__(self, ch_in, ch_out, is_test=True):
+        super(BasicBlock, self).__init__()
+
+        self.conv1 = ConvBNLayer(
+            ch_in=ch_in,
+            ch_out=ch_out,
+            filter_size=1,
+            stride=1,
+            padding=0,
+            is_test=is_test)
+        self.conv2 = ConvBNLayer(
+            ch_in=ch_out,
+            ch_out=ch_out * 2,
+            filter_size=3,
+            stride=1,
+            padding=1,
+            is_test=is_test)
+
+    def forward(self, inputs):
+        conv1 = self.conv1(inputs)
+        conv2 = self.conv2(conv1)
+        out = fluid.layers.elementwise_add(x=inputs, y=conv2, act=None)
+        return out
+
+
+class LayerWarp(fluid.dygraph.Layer):
+    def __init__(self, ch_in, ch_out, count, is_test=True):
+        super(LayerWarp, self).__init__()
+
+        self.basicblock0 = BasicBlock(ch_in, ch_out, is_test=is_test)
+        self.res_out_list = []
+        for i in range(1, count):
+            res_out = self.add_sublayer(
+                "basic_block_%d" % (i),
+                BasicBlock(
+                    ch_out * 2, ch_out, is_test=is_test))
+            self.res_out_list.append(res_out)
+        self.ch_out = ch_out
+
+    def forward(self, inputs):
+        y = self.basicblock0(inputs)
+        for basic_block_i in self.res_out_list:
+            y = basic_block_i(y)
+        return y
+
+
+DarkNet_cfg = {53: ([1, 2, 8, 8, 4])}
+
+
+class DarkNet53_conv_body(fluid.dygraph.Layer):
+    def __init__(self, ch_in=3, is_test=True):
+        super(DarkNet53_conv_body, self).__init__()
+        self.stages = DarkNet_cfg[53]
+        self.stages = self.stages[0:5]
+
+        self.conv0 = ConvBNLayer(
+            ch_in=ch_in,
+            ch_out=32,
+            filter_size=3,
+            stride=1,
+            padding=1,
+            is_test=is_test)
+
+        self.downsample0 = DownSample(ch_in=32, ch_out=32 * 2, is_test=is_test)
+        self.darknet53_conv_block_list = []
+        self.downsample_list = []
+        ch_in = [64, 128, 256, 512, 1024]
+        for i, stage in enumerate(self.stages):
+            conv_block = self.add_sublayer(
+                "stage_%d" % (i),
+                LayerWarp(
+                    int(ch_in[i]), 32 * (2**i), stage, is_test=is_test))
+            self.darknet53_conv_block_list.append(conv_block)
+        for i in range(len(self.stages) - 1):
+            downsample = self.add_sublayer(
+                "stage_%d_downsample" % i,
+                DownSample(
+                    ch_in=32 * (2**(i + 1)),
+                    ch_out=32 * (2**(i + 2)),
+                    is_test=is_test))
+            self.downsample_list.append(downsample)
+
+    def forward(self, inputs):
+
+        out = self.conv0(inputs)
+        out = self.downsample0(out)
+        blocks = []
+        for i, conv_block_i in enumerate(self.darknet53_conv_block_list):
+            out = conv_block_i(out)
+            blocks.append(out)
+            if i < len(self.stages) - 1:
+                out = self.downsample_list[i](out)
+        return blocks[-1:-4:-1]
diff --git a/python/paddle/fluid/tests/unittests/dygraph_to_static/test_yolov3.py b/python/paddle/fluid/tests/unittests/dygraph_to_static/test_yolov3.py
new file mode 100644
index 0000000000000000000000000000000000000000..53ee32cb1d0ae5a66a631bab2147af3dc398ca57
--- /dev/null
+++ b/python/paddle/fluid/tests/unittests/dygraph_to_static/test_yolov3.py
@@ -0,0 +1,174 @@
+# Copyright (c) 2020 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.
+
+import numpy as np
+import random
+import time
+import unittest
+
+import paddle.fluid as fluid
+from paddle.fluid.dygraph import ProgramTranslator
+from paddle.fluid.dygraph import to_variable
+
+from yolov3 import cfg, YOLOv3
+
+random.seed(0)
+np.random.seed(0)
+
+
+class SmoothedValue(object):
+    """Track a series of values and provide access to smoothed values over a
+    window or the global series average.
+    """
+
+    def __init__(self):
+        self.loss_sum = 0.0
+        self.iter_cnt = 0
+
+    def add_value(self, value):
+        self.loss_sum += np.mean(value)
+        self.iter_cnt += 1
+
+    def get_mean_value(self):
+        return self.loss_sum / self.iter_cnt
+
+
+class FakeDataReader(object):
+    def __init__(self):
+        self.generator_out = []
+        self.total_iter = cfg.max_iter
+        for i in range(self.total_iter):
+            batch_out = []
+            for j in range(cfg.batch_size):
+                img = np.random.normal(0.485, 0.229,
+                                       [3, cfg.input_size, cfg.input_size])
+                gt_boxes_node1 = np.random.randint(
+                    low=cfg.input_size / 4,
+                    high=cfg.input_size / 2,
+                    size=[1, 2])
+                gt_boxes_node2 = gt_boxes_node1 + cfg.input_size / 4
+                gt_boxes = np.concatenate(
+                    (gt_boxes_node1, gt_boxes_node2), axis=1)
+                gt_labels = np.random.randint(
+                    low=0, high=cfg.class_num, size=[1])
+                gt_scores = np.zeros([1])
+                batch_out.append([img, gt_boxes, gt_labels, gt_scores])
+            self.generator_out.append(batch_out)
+
+    def reader(self):
+        def generator():
+            for i in range(self.total_iter):
+                yield self.generator_out[i]
+
+        return generator
+
+
+fake_data_reader = FakeDataReader()
+
+
+def train(to_static):
+    program_translator = ProgramTranslator()
+    program_translator.enable(to_static)
+
+    random.seed(0)
+    np.random.seed(0)
+
+    place = fluid.CUDAPlace(0) if cfg.use_gpu else fluid.CPUPlace()
+    with fluid.dygraph.guard(place):
+        fluid.default_startup_program().random_seed = 1000
+        fluid.default_main_program().random_seed = 1000
+        model = YOLOv3(3, is_train=True)
+
+        boundaries = cfg.lr_steps
+        gamma = cfg.lr_gamma
+        step_num = len(cfg.lr_steps)
+        learning_rate = cfg.learning_rate
+        values = [learning_rate * (gamma**i) for i in range(step_num + 1)]
+
+        lr = fluid.dygraph.PiecewiseDecay(
+            boundaries=boundaries, values=values, begin=0)
+
+        lr = fluid.layers.linear_lr_warmup(
+            learning_rate=lr,
+            warmup_steps=cfg.warm_up_iter,
+            start_lr=0.0,
+            end_lr=cfg.learning_rate, )
+
+        optimizer = fluid.optimizer.Momentum(
+            learning_rate=lr,
+            regularization=fluid.regularizer.L2Decay(cfg.weight_decay),
+            momentum=cfg.momentum,
+            parameter_list=model.parameters())
+
+        start_time = time.time()
+        snapshot_loss = 0
+        snapshot_time = 0
+        total_sample = 0
+
+        input_size = cfg.input_size
+        shuffle = True
+        shuffle_seed = None
+        total_iter = cfg.max_iter
+        mixup_iter = total_iter - cfg.no_mixup_iter
+
+        train_reader = FakeDataReader().reader()
+
+        smoothed_loss = SmoothedValue()
+        ret = []
+        for iter_id, data in enumerate(train_reader()):
+            prev_start_time = start_time
+            start_time = time.time()
+            img = np.array([x[0] for x in data]).astype('float32')
+            img = to_variable(img)
+
+            gt_box = np.array([x[1] for x in data]).astype('float32')
+            gt_box = to_variable(gt_box)
+
+            gt_label = np.array([x[2] for x in data]).astype('int32')
+            gt_label = to_variable(gt_label)
+
+            gt_score = np.array([x[3] for x in data]).astype('float32')
+            gt_score = to_variable(gt_score)
+
+            loss = model(img, gt_box, gt_label, gt_score, None, None)
+            smoothed_loss.add_value(np.mean(loss.numpy()))
+            snapshot_loss += loss.numpy()
+            snapshot_time += start_time - prev_start_time
+            total_sample += 1
+
+            print("Iter {:d}, loss {:.6f}, time {:.5f}".format(
+                iter_id,
+                smoothed_loss.get_mean_value(), start_time - prev_start_time))
+            ret.append(smoothed_loss.get_mean_value())
+
+            loss.backward()
+
+            optimizer.minimize(loss)
+            model.clear_gradients()
+
+        return np.array(ret)
+
+
+class TestYolov3(unittest.TestCase):
+    def test_dygraph_static_same_loss(self):
+        dygraph_loss = train(to_static=False)
+        static_loss = train(to_static=True)
+        self.assertTrue(
+            np.allclose(dygraph_loss, static_loss),
+            msg="dygraph_loss: {} \nstatic_loss: {}".format(dygraph_loss,
+                                                            static_loss))
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/python/paddle/fluid/tests/unittests/dygraph_to_static/yolov3.py b/python/paddle/fluid/tests/unittests/dygraph_to_static/yolov3.py
new file mode 100644
index 0000000000000000000000000000000000000000..ca4cb50d6464eb67e222d299318b6ce0001c2954
--- /dev/null
+++ b/python/paddle/fluid/tests/unittests/dygraph_to_static/yolov3.py
@@ -0,0 +1,332 @@
+#  Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
+#
+#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.
+
+from __future__ import division
+from __future__ import print_function
+
+import paddle.fluid as fluid
+from paddle.fluid.dygraph import declarative
+from paddle.fluid.dygraph.base import to_variable
+from paddle.fluid.dygraph.nn import Conv2D, BatchNorm
+from paddle.fluid.initializer import Constant
+from paddle.fluid.initializer import Normal
+from paddle.fluid.param_attr import ParamAttr
+from paddle.fluid.regularizer import L2Decay
+
+from darknet import DarkNet53_conv_body
+from darknet import ConvBNLayer
+
+
+class AttrDict(dict):
+    def __init__(self, *args, **kwargs):
+        super(AttrDict, self).__init__(*args, **kwargs)
+
+    def __getattr__(self, name):
+        if name in self.__dict__:
+            return self.__dict__[name]
+        elif name in self:
+            return self[name]
+        else:
+            raise AttributeError(name)
+
+    def __setattr__(self, name, value):
+        if name in self.__dict__:
+            self.__dict__[name] = value
+        else:
+            self[name] = value
+
+
+#
+# Training options
+#
+cfg = AttrDict()
+# Snapshot period
+cfg.snapshot_iter = 2000
+# min valid area for gt boxes
+cfg.gt_min_area = -1
+# max target box number in an image
+cfg.max_box_num = 50
+# valid score threshold to include boxes
+cfg.valid_thresh = 0.005
+# threshold vale for box non-max suppression
+cfg.nms_thresh = 0.45
+# the number of top k boxes to perform nms
+cfg.nms_topk = 400
+# the number of output boxes after nms
+cfg.nms_posk = 100
+# score threshold for draw box in debug mode
+cfg.draw_thresh = 0.5
+# Use label smooth in class label
+cfg.label_smooth = True
+#
+# Model options
+#
+# input size
+cfg.input_size = 608
+# pixel mean values
+cfg.pixel_means = [0.485, 0.456, 0.406]
+# pixel std values
+cfg.pixel_stds = [0.229, 0.224, 0.225]
+# anchors box weight and height
+cfg.anchors = [
+    10, 13, 16, 30, 33, 23, 30, 61, 62, 45, 59, 119, 116, 90, 156, 198, 373, 326
+]
+# anchor mask of each yolo layer
+cfg.anchor_masks = [[6, 7, 8], [3, 4, 5], [0, 1, 2]]
+# IoU threshold to ignore objectness loss of pred box
+cfg.ignore_thresh = .7
+#
+# SOLVER options
+#
+# batch size
+cfg.batch_size = 8 if fluid.is_compiled_with_cuda() else 4
+# derived learning rate the to get the final learning rate.
+cfg.learning_rate = 0.001
+# maximum number of iterations
+cfg.max_iter = 20 if fluid.is_compiled_with_cuda() else 2
+# Disable mixup in last N iter
+cfg.no_mixup_iter = 10 if fluid.is_compiled_with_cuda() else 1
+# warm up to learning rate 
+cfg.warm_up_iter = 10 if fluid.is_compiled_with_cuda() else 1
+cfg.warm_up_factor = 0.
+# lr steps_with_decay
+cfg.lr_steps = [400000, 450000]
+cfg.lr_gamma = 0.1
+# L2 regularization hyperparameter
+cfg.weight_decay = 0.0005
+# momentum with SGD
+cfg.momentum = 0.9
+#
+# ENV options
+#
+# support both CPU and GPU
+cfg.use_gpu = fluid.is_compiled_with_cuda()
+# Class number
+cfg.class_num = 80
+
+
+class YoloDetectionBlock(fluid.dygraph.Layer):
+    def __init__(self, ch_in, channel, is_test=True):
+        super(YoloDetectionBlock, self).__init__()
+
+        assert channel % 2 == 0, \
+            "channel {} cannot be divided by 2".format(channel)
+
+        self.conv0 = ConvBNLayer(
+            ch_in=ch_in,
+            ch_out=channel,
+            filter_size=1,
+            stride=1,
+            padding=0,
+            is_test=is_test)
+        self.conv1 = ConvBNLayer(
+            ch_in=channel,
+            ch_out=channel * 2,
+            filter_size=3,
+            stride=1,
+            padding=1,
+            is_test=is_test)
+        self.conv2 = ConvBNLayer(
+            ch_in=channel * 2,
+            ch_out=channel,
+            filter_size=1,
+            stride=1,
+            padding=0,
+            is_test=is_test)
+        self.conv3 = ConvBNLayer(
+            ch_in=channel,
+            ch_out=channel * 2,
+            filter_size=3,
+            stride=1,
+            padding=1,
+            is_test=is_test)
+        self.route = ConvBNLayer(
+            ch_in=channel * 2,
+            ch_out=channel,
+            filter_size=1,
+            stride=1,
+            padding=0,
+            is_test=is_test)
+        self.tip = ConvBNLayer(
+            ch_in=channel,
+            ch_out=channel * 2,
+            filter_size=3,
+            stride=1,
+            padding=1,
+            is_test=is_test)
+
+    def forward(self, inputs):
+        out = self.conv0(inputs)
+        out = self.conv1(out)
+        out = self.conv2(out)
+        out = self.conv3(out)
+        route = self.route(out)
+        tip = self.tip(route)
+        return route, tip
+
+
+class Upsample(fluid.dygraph.Layer):
+    def __init__(self, scale=2):
+        super(Upsample, self).__init__()
+        self.scale = scale
+
+    def forward(self, inputs):
+        # get dynamic upsample output shape
+        shape_nchw = fluid.layers.shape(inputs)
+        shape_hw = fluid.layers.slice(
+            shape_nchw, axes=[0], starts=[2], ends=[4])
+        shape_hw.stop_gradient = True
+        in_shape = fluid.layers.cast(shape_hw, dtype='int32')
+        out_shape = in_shape * self.scale
+        out_shape.stop_gradient = True
+
+        # reisze by actual_shape
+        out = fluid.layers.resize_nearest(
+            input=inputs, scale=self.scale, actual_shape=out_shape)
+        return out
+
+
+class YOLOv3(fluid.dygraph.Layer):
+    def __init__(self, ch_in, is_train=True, use_random=False):
+        super(YOLOv3, self).__init__()
+
+        self.is_train = is_train
+        self.use_random = use_random
+
+        self.block = DarkNet53_conv_body(ch_in=ch_in, is_test=not self.is_train)
+        self.block_outputs = []
+        self.yolo_blocks = []
+        self.route_blocks_2 = []
+        ch_in_list = [1024, 768, 384]
+        for i in range(3):
+            yolo_block = self.add_sublayer(
+                "yolo_detecton_block_%d" % (i),
+                YoloDetectionBlock(
+                    ch_in_list[i],
+                    channel=512 // (2**i),
+                    is_test=not self.is_train))
+            self.yolo_blocks.append(yolo_block)
+
+            num_filters = len(cfg.anchor_masks[i]) * (cfg.class_num + 5)
+
+            block_out = self.add_sublayer(
+                "block_out_%d" % (i),
+                Conv2D(
+                    num_channels=1024 // (2**i),
+                    num_filters=num_filters,
+                    filter_size=1,
+                    stride=1,
+                    padding=0,
+                    act=None,
+                    param_attr=ParamAttr(
+                        initializer=fluid.initializer.Normal(0., 0.02)),
+                    bias_attr=ParamAttr(
+                        initializer=fluid.initializer.Constant(0.0),
+                        regularizer=L2Decay(0.))))
+            self.block_outputs.append(block_out)
+            if i < 2:
+                route = self.add_sublayer(
+                    "route2_%d" % i,
+                    ConvBNLayer(
+                        ch_in=512 // (2**i),
+                        ch_out=256 // (2**i),
+                        filter_size=1,
+                        stride=1,
+                        padding=0,
+                        is_test=(not self.is_train)))
+                self.route_blocks_2.append(route)
+            self.upsample = Upsample()
+
+    @declarative
+    def forward(self,
+                inputs,
+                gtbox=None,
+                gtlabel=None,
+                gtscore=None,
+                im_id=None,
+                im_shape=None):
+        self.outputs = []
+        self.boxes = []
+        self.scores = []
+        self.losses = []
+        self.downsample = 32
+        blocks = self.block(inputs)
+        for i, block in enumerate(blocks):
+            if i > 0:
+                block = fluid.layers.concat(input=[route, block], axis=1)
+            route, tip = self.yolo_blocks[i](block)
+            block_out = self.block_outputs[i](tip)
+            self.outputs.append(block_out)
+
+            if i < 2:
+                route = self.route_blocks_2[i](route)
+                route = self.upsample(route)
+        self.gtbox = gtbox
+        self.gtlabel = gtlabel
+        self.gtscore = gtscore
+        self.im_id = im_id
+        self.im_shape = im_shape
+
+        # cal loss
+        for i, out in enumerate(self.outputs):
+            anchor_mask = cfg.anchor_masks[i]
+            if self.is_train:
+                loss = fluid.layers.yolov3_loss(
+                    x=out,
+                    gt_box=self.gtbox,
+                    gt_label=self.gtlabel,
+                    gt_score=self.gtscore,
+                    anchors=cfg.anchors,
+                    anchor_mask=anchor_mask,
+                    class_num=cfg.class_num,
+                    ignore_thresh=cfg.ignore_thresh,
+                    downsample_ratio=self.downsample,
+                    use_label_smooth=cfg.label_smooth)
+                self.losses.append(fluid.layers.reduce_mean(loss))
+
+            else:
+                mask_anchors = []
+                for m in anchor_mask:
+                    mask_anchors.append(cfg.anchors[2 * m])
+                    mask_anchors.append(cfg.anchors[2 * m + 1])
+                boxes, scores = fluid.layers.yolo_box(
+                    x=out,
+                    img_size=self.im_shape,
+                    anchors=mask_anchors,
+                    class_num=cfg.class_num,
+                    conf_thresh=cfg.valid_thresh,
+                    downsample_ratio=self.downsample,
+                    name="yolo_box" + str(i))
+                self.boxes.append(boxes)
+                self.scores.append(
+                    fluid.layers.transpose(
+                        scores, perm=[0, 2, 1]))
+            self.downsample //= 2
+
+        if not self.is_train:
+            # get pred
+            yolo_boxes = fluid.layers.concat(self.boxes, axis=1)
+            yolo_scores = fluid.layers.concat(self.scores, axis=2)
+
+            pred = fluid.layers.multiclass_nms(
+                bboxes=yolo_boxes,
+                scores=yolo_scores,
+                score_threshold=cfg.valid_thresh,
+                nms_top_k=cfg.nms_topk,
+                keep_top_k=cfg.nms_posk,
+                nms_threshold=cfg.nms_thresh,
+                background_label=-1)
+            return pred
+        else:
+            return sum(self.losses)