diff --git a/agent/async_agent.py b/agent/async_agent.py
index de1eba8..c0fdac4 100644
--- a/agent/async_agent.py
+++ b/agent/async_agent.py
@@ -75,14 +75,19 @@ class AsyncAgent:
             target_network.share_memory()
             target_network.load_state_dict(learning_network.state_dict())
             extra = target_network
-        elif config.worker == ContinuousAdvantageActorCritic or config.worker == ProximalPolicyOptimization:
+        elif config.worker == ContinuousAdvantageActorCritic \
+                or config.worker == ProximalPolicyOptimization\
+                or config.worker == DeterministicPolicyGradient:
             state_normalizer = StaticNormalizer(task.state_dim)
             reward_normalizer = StaticNormalizer(1)
             extra = [state_normalizer, reward_normalizer]
+            if config.worker == DeterministicPolicyGradient:
+                extra.append(config.replay_fn())
         else:
             extra = None
         args = [(i, config, learning_network, extra) for i in range(config.num_workers)]
         args.append((config, task, learning_network, extra))
+        # procs = []
         procs = [mp.Process(target=evaluate, args=args[-1])]
         procs.extend([mp.Process(target=train, args=args[i]) for i in range(config.num_workers)])
         for p in procs: p.start()
diff --git a/async_worker/__init__.py b/async_worker/__init__.py
index ee5e06e..9a2160d 100644
--- a/async_worker/__init__.py
+++ b/async_worker/__init__.py
@@ -3,4 +3,5 @@ from .continuous_actor_critic import *
 from .n_step_q import *
 from .one_step_sarsa import *
 from .one_step_q import *
-from .ppo import *
\ No newline at end of file
+from .ppo import *
+from .dpg import *
\ No newline at end of file
diff --git a/async_worker/dpg.py b/async_worker/dpg.py
new file mode 100644
index 0000000..bb74296
--- /dev/null
+++ b/async_worker/dpg.py
@@ -0,0 +1,120 @@
+#######################################################################
+# Copyright (C) 2017 Shangtong Zhang(zhangshangtong.cpp@gmail.com)    #
+# Permission given to modify the code as long as you keep this        #
+# declaration at the top                                              #
+#######################################################################
+
+import numpy as np
+import torch.multiprocessing as mp
+from network import *
+from utils import *
+from component import *
+from async_worker import *
+import pickle
+import os
+import time
+
+class DeterministicPolicyGradient:
+    def __init__(self, config, shared_network, extra):
+        self.config = config
+        self.task = config.task_fn()
+
+        self.shared_network = shared_network
+        self.worker_network = config.network_fn()
+        self.worker_network.load_state_dict(self.shared_network.state_dict())
+        self.target_network = config.network_fn()
+        self.target_network.load_state_dict(self.worker_network.state_dict())
+        self.actor_opt = config.actor_optimizer_fn(self.shared_network.actor.parameters())
+        self.critic_opt = config.critic_optimizer_fn(self.shared_network.critic.parameters())
+
+        self.random_process = config.random_process_fn()
+        self.criterion = nn.MSELoss()
+
+        # self.state_normalizer = Normalizer(self.task.state_dim)
+        self.shared_state_normalizer = extra[0]
+        self.state_normalizer = StaticNormalizer(self.task.state_dim)
+        # self.replay = config.replay_fn()
+        self.replay = extra[-1]
+
+    def soft_update(self, target, src):
+        for target_param, param in zip(target.parameters(), src.parameters()):
+            target_param.data.copy_(target_param.data * (1.0 - self.config.target_network_mix) +
+                                    param.data * self.config.target_network_mix)
+
+    def episode(self, deterministic=False):
+        self.random_process.reset_states()
+        state = self.task.reset()
+        state = self.state_normalizer(state)
+
+        config = self.config
+        actor = self.worker_network.actor
+        critic = self.worker_network.critic
+        target_actor = self.target_network.actor
+        target_critic = self.target_network.critic
+
+        steps = 0
+        total_reward = 0.0
+        while True:
+            actor.eval()
+            action = actor.predict(np.stack([state])).flatten()
+            if not deterministic:
+                action += self.random_process.sample()
+            next_state, reward, done, info = self.task.step(action)
+            done = (done or (config.max_episode_length and steps >= config.max_episode_length))
+            next_state = self.state_normalizer(next_state)
+            total_reward += reward
+
+            if not deterministic:
+                self.replay.feed([state, action, reward, next_state, int(done)])
+                with config.steps_lock:
+                    config.total_steps.value += 1
+
+            steps += 1
+            state = next_state
+
+            if done:
+                break
+
+            if not deterministic and self.replay.size() >= config.min_memory_size:
+                self.worker_network.train()
+                experiences = self.replay.sample()
+                states, actions, rewards, next_states, terminals = experiences
+                q_next = target_critic.predict(next_states, target_actor.predict(next_states))
+                terminals = critic.to_torch_variable(terminals).unsqueeze(1)
+                rewards = critic.to_torch_variable(rewards).unsqueeze(1)
+                q_next = config.discount * q_next * (1 - terminals)
+                q_next.add_(rewards)
+                q_next = q_next.detach()
+                q = critic.predict(states, actions)
+                critic_loss = self.criterion(q, q_next)
+
+                critic.zero_grad()
+                self.critic_opt.zero_grad()
+                critic_loss.backward()
+                with config.network_lock:
+                    for param, worker_param in zip(self.shared_network.critic.parameters(), critic.parameters()):
+                        if param.grad is not None:
+                            break
+                        param._grad = worker_param.grad
+                    self.critic_opt.step()
+
+                actions = actor.predict(states, False)
+                var_actions = Variable(actions.data, requires_grad=True)
+                q = critic.predict(states, var_actions)
+                q.backward(torch.ones(q.size()))
+
+                actor.zero_grad()
+                self.actor_opt.zero_grad()
+                actions.backward(-var_actions.grad.data)
+                with config.network_lock:
+                    for param, worker_param in zip(self.shared_network.actor.parameters(), actor.parameters()):
+                        if param.grad is not None:
+                            break
+                        param._grad = worker_param.grad
+                    self.actor_opt.step()
+
+                self.worker_network.load_state_dict(self.shared_network.state_dict())
+
+                self.soft_update(self.target_network, self.worker_network)
+
+        return steps, total_reward
diff --git a/async_worker/ppo.py b/async_worker/ppo.py
index 9224c93..b0992ee 100644
--- a/async_worker/ppo.py
+++ b/async_worker/ppo.py
@@ -72,7 +72,6 @@ class ProximalPolicyOptimization:
                 values.append(value)
                 state, reward, done, _ = self.task.step(action)
                 state = self.state_normalizer(state)
-                # print state
                 done = (done or (config.max_episode_length and episode_length > config.max_episode_length))
 
                 batched_rewards += reward
diff --git a/component/replay.py b/component/replay.py
index ff07329..48fb2d0 100644
--- a/component/replay.py
+++ b/component/replay.py
@@ -7,6 +7,7 @@
 import numpy as np
 import torch
 import random
+import torch.multiprocessing as mp
 
 class Replay:
     def __init__(self, memory_size, batch_size, dtype=np.float32):
@@ -95,6 +96,62 @@ class HybridRewardReplay:
                 self.next_states[sampled_indices],
                 self.terminals[sampled_indices]]
 
+class SharedReplay:
+    def __init__(self, memory_size, batch_size, state_shape, action_shape):
+        self.memory_size = memory_size
+        self.batch_size = batch_size
+
+        self.states = torch.zeros((self.memory_size, ) + state_shape)
+        self.actions = torch.zeros((self.memory_size, ) + action_shape)
+        self.rewards = torch.zeros(self.memory_size)
+        self.next_states = torch.zeros((self.memory_size, ) + state_shape)
+        self.terminals = torch.zeros(self.memory_size)
+
+        self.states.share_memory_()
+        self.actions.share_memory_()
+        self.rewards.share_memory_()
+        self.next_states.share_memory_()
+        self.terminals.share_memory_()
+
+        self.pos = 0
+        self.full = False
+        self.buffer_lock = mp.Lock()
+
+    def feed_(self, experience):
+        state, action, reward, next_state, done = experience
+        self.states[self.pos][:] = torch.FloatTensor(state)
+        self.actions[self.pos][:] = torch.FloatTensor(action)
+        self.rewards[self.pos] = reward
+        self.next_states[self.pos][:] = torch.FloatTensor(next_state)
+        self.terminals[self.pos] = done
+
+        self.pos += 1
+        if self.pos == self.memory_size:
+            self.full = True
+            self.pos = 0
+
+    def size(self):
+        if self.full:
+            return self.memory_size
+        return self.pos
+
+    def sample_(self):
+        upper_bound = self.memory_size if self.full else self.pos
+        sampled_indices = torch.LongTensor(np.random.randint(0, upper_bound, size=self.batch_size))
+        return [self.states[sampled_indices],
+                self.actions[sampled_indices],
+                self.rewards[sampled_indices],
+                self.next_states[sampled_indices],
+                self.terminals[sampled_indices]]
+
+    def feed(self, experience):
+        with self.buffer_lock:
+            self.feed_(experience)
+
+    def sample(self):
+        with self.buffer_lock:
+            return self.sample_()
+
 class HighDimActionReplay:
     def __init__(self, memory_size, batch_size, dtype=np.float32):
         self.memory_size = memory_size
@@ -130,6 +187,11 @@ class HighDimActionReplay:
             self.full = True
             self.pos = 0
 
+    def size(self):
+        if self.full:
+            return self.memory_size
+        return self.pos
+
     def sample(self):
         upper_bound = self.memory_size if self.full else self.pos
         sampled_indices = np.random.randint(0, upper_bound, size=self.batch_size)
diff --git a/main.py b/main.py
index 87c6ce6..06aa69a 100644
--- a/main.py
+++ b/main.py
@@ -201,9 +201,9 @@ def a3c_continuous():
 
 def p3o_continuous():
     config = Config()
-    config.task_fn = lambda: Pendulum()
+    # config.task_fn = lambda: Pendulum()
     # config.task_fn = lambda: BipedalWalkerHardcore()
-    # config.task_fn = lambda: Roboschool('RoboschoolInvertedPendulum-v1')
+    config.task_fn = lambda: Roboschool('RoboschoolInvertedPendulum-v1')
     # config.task_fn = lambda: Roboschool('RoboschoolAnt-v1')
     task = config.task_fn()
     config.actor_network_fn = lambda: GaussianActorNet(task.state_dim, task.action_dim,
@@ -214,7 +214,8 @@ def p3o_continuous():
     config.critic_optimizer_fn = lambda params: torch.optim.Adam(params, 0.001)
 
     config.policy_fn = lambda: GaussianPolicy()
-    config.replay_fn = lambda: GeneralReplay(memory_size=2048, batch_size=2048)
+    # config.replay_fn = lambda: GeneralReplay(memory_size=2048, batch_size=2048)
+    config.replay_fn = lambda: GeneralReplay(memory_size=2048, batch_size=64)
     config.worker = ProximalPolicyOptimization
     config.discount = 0.99
     config.gae_tau = 0.97
@@ -225,7 +226,7 @@ def p3o_continuous():
     config.entropy_weight = 0
     config.gradient_clip = 20
     config.rollout_length = 10000
-    config.optimize_epochs = 1
+    config.optimize_epochs = 10
     config.ppo_ratio_clip = 0.2
     config.logger = Logger('./log', gym.logger)
     agent = AsyncAgent(config)
@@ -261,16 +262,56 @@ def ddpg_continuous():
     config.logger = Logger('./log', gym.logger)
     run_episodes(DDPGAgent(config))
 
+def addpg_continuous():
+    config = Config()
+    # config.task_fn = lambda: Pendulum()
+    # config.task_fn = lambda: ContinuousLunarLander()
+    config.task_fn = lambda: Roboschool('RoboschoolInvertedPendulum-v1')
+    # config.task_fn = lambda: Roboschool('RoboschoolReacher-v1')
+    # config.task_fn = lambda: BipedalWalker()
+    task = config.task_fn()
+    config.actor_network_fn = lambda: DeterministicActorNet(
+        task.state_dim, task.action_dim, F.tanh, 2, non_linear=F.relu, batch_norm=False)
+    config.critic_network_fn = lambda: DeterministicCriticNet(
+        task.state_dim, task.action_dim, non_linear=F.relu, batch_norm=False)
+    config.network_fn = lambda: DisjointActorCriticNet(config.actor_network_fn, config.critic_network_fn)
+    config.actor_optimizer_fn = lambda params: torch.optim.Adam(params, lr=1e-4)
+    config.critic_optimizer_fn =\
+        lambda params: torch.optim.Adam(params, lr=1e-4)
+    # config.replay_fn = lambda: HighDimActionReplay(memory_size=1000000, batch_size=64)
+    config.replay_fn = lambda: SharedReplay(memory_size=1000000, batch_size=64,
+                                            state_shape=(task.state_dim, ), action_shape=(task.action_dim, ))
+    # config.replay_fn = lambda: GeneralReplay(memory_size=256, batch_size=64)
+    config.discount = 0.99
+    config.max_episode_length = task.max_episode_steps
+    config.random_process_fn = \
+        lambda: OrnsteinUhlenbeckProcess(size=task.action_dim, theta=0.15, sigma=0.2,
+                                         n_steps_annealing=100000)
+    config.worker = DeterministicPolicyGradient
+    config.num_workers = 6
+    config.min_memory_size = 50
+    config.target_network_mix = 0.001
+    # config.update_interval = 10
+    config.test_interval = 500
+    config.test_repetitions = 1
+    config.gradient_clip = 20
+    config.rollout_length = 16
+    config.optimize_epochs = 1
+    config.logger = Logger('./log', gym.logger)
+    agent = AsyncAgent(config)
+    agent.run()
+
 if __name__ == '__main__':
-    # gym.logger.setLevel(logging.DEBUG)
-    gym.logger.setLevel(logging.INFO)
+    gym.logger.setLevel(logging.DEBUG)
+    # gym.logger.setLevel(logging.INFO)
 
     # dqn_cart_pole()
     # async_cart_pole()
     # a3c_cart_pole()
     # a3c_continuous()
     # p3o_continuous()
-    ddpg_continuous()
+    # ddpg_continuous()
+    addpg_continuous()
 
     # dqn_fruit()
     # hrdqn_fruit()