diff --git a/python/paddle/distributed/auto_parallel/cost/__init__.py b/python/paddle/distributed/auto_parallel/cost/__init__.py
index 9ea58d697952775b028a796122a2a115030e2271..ea6b3bc5b7e76940f67badf2bced4e54a87f436c 100644
--- a/python/paddle/distributed/auto_parallel/cost/__init__.py
+++ b/python/paddle/distributed/auto_parallel/cost/__init__.py
@@ -14,7 +14,16 @@
 
 from .base_cost import _g_op_cost_factory
 from .base_cost import Cost
-from .comm_op_cost import AllreduceSumCost
-from .comp_op_cost import MatmulV2OpCost
+from .base_cost import CommContext
+from .base_cost import build_comm_desc
 from .tensor_cost import TensorCost
 from .estimate_cost import CostEstimator
+
+from .comp_op_cost import MatmulV2OpCost
+
+from .comm_op_cost import SendOpCost
+from .comm_op_cost import RecvOpCost
+from .comm_op_cost import IdentityOpCost
+from .comm_op_cost import BroadcastOpCost
+from .comm_op_cost import AllgatherOpCost
+from .comm_op_cost import AllreduceSumOpCost
diff --git a/python/paddle/distributed/auto_parallel/cost/base_cost.py b/python/paddle/distributed/auto_parallel/cost/base_cost.py
index cb16d522bc9e3788175a71734a2359b7986debc8..f1843b8f16527280ff477be4b85d722ffb54ef75 100644
--- a/python/paddle/distributed/auto_parallel/cost/base_cost.py
+++ b/python/paddle/distributed/auto_parallel/cost/base_cost.py
@@ -13,15 +13,31 @@
 # limitations under the License
 
 from collections import OrderedDict
+from functools import reduce
+
 import paddle
 
+from ..cluster import LinkType
+from ..process_group import get_process_group
+
 COMM_OP_TYPE = [
-    "send_v2", "recv_v2", "c_broadcast", "c_allgather", "c_allreduce_sum"
+    "send_v2", "recv_v2", "c_broadcast", "c_allgather", "c_allreduce_sum",
+    "c_identity"
 ]
 NON_COMP_TYPE = ["while"] + COMM_OP_TYPE
 _g_op_cost_factory = {}
 
 
+def build_comm_desc(op_type, group_ranks, dtype, shape, attrs=None):
+    desc = {}
+    desc["op"] = op_type
+    desc["group_ranks"] = group_ranks
+    desc["inputs"] = {"X": [(dtype, shape)]}
+    if attrs is not None:
+        desc["attrs"] = attrs
+    return desc
+
+
 def _parse_op_to_desc(op, dist_context=None):
     desc = {}
     desc["op"] = op.type
diff --git a/python/paddle/distributed/auto_parallel/cost/comm_op_cost.py b/python/paddle/distributed/auto_parallel/cost/comm_op_cost.py
index 235741ba12f4fb67d072043a06733549d19df36a..a32fdf1824e6293be31352a6ac2665c250fca790 100644
--- a/python/paddle/distributed/auto_parallel/cost/comm_op_cost.py
+++ b/python/paddle/distributed/auto_parallel/cost/comm_op_cost.py
@@ -12,17 +12,149 @@
 # See the License for the specific language governing permissions and
 # limitations under the License
 
-from .base_cost import register_op_cost, CommOpCost
+import math
+
+from .base_cost import register_op_cost, CommOpCost, _g_op_cost_factory
 
 
 @register_op_cost
-class AllreduceSumCost(CommOpCost):
+class AllreduceSumOpCost(CommOpCost):
     OP_TYPE = "c_allreduce_sum"
 
     def __init__(self, op=None, op_desc=None, comm_context=None):
-        super(AllreduceSumCost, self).__init__(
+        super(AllreduceSumOpCost, self).__init__(
+            op=op, op_desc=op_desc, comm_context=comm_context)
+
+    def calc_time(self):
+        # use tree if cross machine and use ring if in a single machine
+        time = None
+        cluster = self.comm_context.cluster
+        if not cluster.cross_machine(self.group_ranks):
+            time = self.calc_time_ring()
+        else:
+            time = self.calc_time_tree()
+
+        return time
+
+    def calc_time_ring(self):
+        alpha = self.comm_context.base_ring
+        alpha += 2 * (
+            self.rank_count - self.machine_count) * self.comm_context.intra_ring
+        alpha += 2 * (self.machine_count - 1) * (
+            self.comm_context.inter_ring + self.hops * self.comm_context.switch)
+        beta = self.comm_context.get_max_beta(self.group_ranks)
+        time = alpha + 2 * (self.rank_count - 1
+                            ) / self.rank_count * self.comm_count * beta
+
+        return time
+
+    def calc_time_tree(self):
+        alpha = self.comm_context.base_tree
+        alpha += 2 * (self.rank_count / self.machine_count - 1
+                      ) * self.comm_context.intra_tree
+        alpha += math.log2(self.machine_count) * (
+            self.comm_context.inter_tree + self.hops * self.comm_context.switch)
+        beta = self.comm_context.get_max_beta(self.group_ranks)
+
+        time = alpha + 2 * self.comm_count * beta
+
+        return time
+
+
+@register_op_cost
+class AllgatherOpCost(CommOpCost):
+    OP_TYPE = "c_allgather"
+
+    def __init__(self, op=None, op_desc=None, comm_context=None):
+        super(AllgatherOpCost, self).__init__(
+            op=op, op_desc=op_desc, comm_context=comm_context)
+
+    def calc_time(self):
+        time = self.calc_time_ring()
+        return time
+
+    def calc_time_ring(self):
+        alpha = self.comm_context.base_ring
+        alpha += (
+            self.rank_count - self.machine_count) * self.comm_context.intra_ring
+        alpha += (self.machine_count - 1) * (
+            self.comm_context.inter_ring + self.hops * self.comm_context.switch)
+        beta = self.comm_context.get_max_beta(self.group_ranks)
+        time = alpha + (self.rank_count - 1
+                        ) / self.rank_count * self.comm_count * beta
+        return time
+
+
+@register_op_cost
+class BroadcastOpCost(CommOpCost):
+    OP_TYPE = "c_broadcast"
+
+    def __init__(self, op=None, op_desc=None, comm_context=None):
+        super(BroadcastOpCost, self).__init__(
+            op=op, op_desc=op_desc, comm_context=comm_context)
+
+    def calc_time(self):
+        time = self.calc_time_ring()
+        return time
+
+    def calc_time_ring(self):
+        alpha = self.comm_context.base_ring
+        if self.machine_count > 1:
+            alpha += self.comm_context.inter_ring + self.hops * self.comm_context.switch
+        else:
+            alpha += self.comm_context.intra_ring
+        beta = self.comm_context.get_max_beta(self.group_ranks)
+        time = alpha + self.comm_count * beta
+
+        return time
+
+
+@register_op_cost
+class IdentityOpCost(CommOpCost):
+    OP_TYPE = "c_identity"
+
+    def __init__(self, op=None, op_desc=None, comm_context=None):
+        super(IdentityOpCost, self).__init__(
             op=op, op_desc=op_desc, comm_context=comm_context)
 
     def calc_time(self):
-        # NOTE: The actual formula will be filled in the future.
         return 0
+
+
+@register_op_cost
+class RecvOpCost(CommOpCost):
+    OP_TYPE = "recv_v2"
+
+    def __init__(self, op=None, op_desc=None, comm_context=None):
+        super(RecvOpCost, self).__init__(
+            op=op, op_desc=op_desc, comm_context=comm_context)
+
+    def calc_time(self):
+        alpha = self.comm_context.base_ring
+        if self.machine_count > 1:
+            alpha += self.comm_context.inter_ring + self.hops * self.comm_context.switch
+        else:
+            alpha += self.comm_context.intra_ring
+        beta = self.comm_context.get_max_beta(self.group_ranks)
+        time = alpha + self.comm_count * beta
+        return time
+
+
+@register_op_cost
+class SendOpCost(CommOpCost):
+    OP_TYPE = "send_v2"
+
+    def __init__(self, op=None, op_desc=None, comm_context=None):
+        super(SendOpCost, self).__init__(
+            op=op, op_desc=op_desc, comm_context=comm_context)
+
+    def calc_time(self):
+        alpha = self.comm_context.base_ring
+        if self.machine_count > 1:
+            alpha += self.comm_context.inter_ring + self.hops * self.comm_context.switch
+        else:
+            alpha += self.comm_context.intra_ring
+        beta = self.comm_context.get_max_beta(self.group_ranks)
+        time = alpha + self.comm_count * beta
+
+        return time
diff --git a/python/paddle/fluid/tests/unittests/auto_parallel/CMakeLists.txt b/python/paddle/fluid/tests/unittests/auto_parallel/CMakeLists.txt
index 7c747338593a393f135b64faa509ca736074da8d..1f846f5d7361c0210be022b453d0dd178d24821e 100644
--- a/python/paddle/fluid/tests/unittests/auto_parallel/CMakeLists.txt
+++ b/python/paddle/fluid/tests/unittests/auto_parallel/CMakeLists.txt
@@ -29,4 +29,5 @@ if(WITH_DISTRIBUTE AND WITH_GPU)
     py_test_modules(test_dist_pnorm MODULES test_dist_pnorm ENVS ${dist_ENVS})
     py_test_modules(test_dist_slice MODULES test_dist_slice ENVS ${dist_ENVS})
     py_test_modules(test_cluster MODULES test_cluster ENVS ${dist_ENVS})
+    py_test_modules(test_comm_cost MODULES test_comm_cost ENVS ${dist_ENVS})
 endif()
diff --git a/python/paddle/fluid/tests/unittests/auto_parallel/test_comm_cost.py b/python/paddle/fluid/tests/unittests/auto_parallel/test_comm_cost.py
new file mode 100644
index 0000000000000000000000000000000000000000..f0ad1f4ed314de8b35f8909f9f8ee8355261b52f
--- /dev/null
+++ b/python/paddle/fluid/tests/unittests/auto_parallel/test_comm_cost.py
@@ -0,0 +1,158 @@
+# Copyright (c) 2021 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 unittest
+import os
+import json
+
+import paddle
+from paddle.distributed.auto_parallel.cluster import Cluster
+from paddle.distributed.auto_parallel.cost import CommContext
+from paddle.distributed.auto_parallel.cost import build_comm_desc
+from paddle.distributed.auto_parallel.cost import AllreduceSumOpCost
+from paddle.distributed.auto_parallel.cost import AllgatherOpCost
+from paddle.distributed.auto_parallel.cost import BroadcastOpCost
+from paddle.distributed.auto_parallel.cost import SendOpCost
+from paddle.distributed.auto_parallel.cost import RecvOpCost
+from paddle.distributed.auto_parallel.cost import IdentityOpCost
+
+from test_cluster import cluster_json, multi_cluster_json
+
+
+class TestCommOpCost(unittest.TestCase):
+    def test_comm_cost(self):
+        # Build cluster
+        file_dir = os.path.dirname(os.path.abspath(__file__))
+        cluster_json_path = os.path.join(file_dir, "auto_parallel_cluster.json")
+        cluster_json_object = json.loads(cluster_json)
+        with open(cluster_json_path, "w") as cluster_json_file:
+            json.dump(cluster_json_object, cluster_json_file)
+        cluster = Cluster()
+        cluster.build_from_file(cluster_json_path)
+
+        # Build CommConetxt
+        CommContext._has_instance = None
+        CommContext._instance = None
+        comm_context = CommContext(cluster)
+
+        # Check AllreduceSumCost 128MB ring cost
+        allreduce_sum_op_desc = build_comm_desc(
+            "c_allreduce_sum", [0, 1, 2, 3, 4, 5, 6, 7], paddle.float32,
+            [1, 32 * (10**6)])
+        allreduce_sum_op_cost = AllreduceSumOpCost(
+            op_desc=allreduce_sum_op_desc, comm_context=comm_context)
+
+        # Check AllgatherOpCost cost
+        allgather_op_desc = build_comm_desc("c_allgather",
+                                            [0, 1, 2, 3, 4, 5, 6, 7],
+                                            paddle.float32, [1, 32 * (10**6)])
+        allgather_op_cost = AllgatherOpCost(
+            op_desc=allgather_op_desc, comm_context=comm_context)
+        self.assertTrue(allgather_op_cost.time > 0)
+
+        # Check BroadcastOpCost cost
+        broadcast_op_desc = build_comm_desc("c_broadcast",
+                                            [0, 1, 2, 3, 4, 5, 6, 7],
+                                            paddle.float32, [1, 32 * (10**6)])
+        broadcast_op_cost = BroadcastOpCost(
+            op_desc=broadcast_op_desc, comm_context=comm_context)
+        self.assertTrue(broadcast_op_cost.time > 0)
+
+        # Check SendOpCost cost
+        send_op_desc = build_comm_desc("send_v2", [0, 1], paddle.float32,
+                                       [1, 32 * (10**6)])
+        send_op_cost = SendOpCost(
+            op_desc=send_op_desc, comm_context=comm_context)
+        self.assertTrue(send_op_cost.time > 0)
+
+        # Check RecvOpCost cost
+        recv_op_desc = build_comm_desc("recv_v2", [0, 1], paddle.float32,
+                                       [1, 32 * (10**6)])
+        recv_op_cost = RecvOpCost(
+            op_desc=recv_op_desc, comm_context=comm_context)
+        self.assertTrue(recv_op_cost.time > 0)
+
+        # Check IdentityOpCost cost
+        identity_op_desc = build_comm_desc("c_identity", [0, 1], paddle.float32,
+                                           [1, 32 * (10**6)])
+        identity_op_cost = IdentityOpCost(
+            op_desc=identity_op_desc, comm_context=comm_context)
+        self.assertTrue(identity_op_cost.time >= 0)
+
+        # Remove unnecessary files
+        if os.path.exists(cluster_json_path):
+            os.remove(cluster_json_path)
+
+    def test_cross_machine_comm_cost(self):
+        # Build cluster
+        file_dir = os.path.dirname(os.path.abspath(__file__))
+        cluster_json_path = os.path.join(file_dir, "auto_parallel_cluster.json")
+        cluster_json_object = json.loads(multi_cluster_json)
+        with open(cluster_json_path, "w") as cluster_json_file:
+            json.dump(cluster_json_object, cluster_json_file)
+        cluster = Cluster()
+        cluster.build_from_file(cluster_json_path)
+
+        # Build CommConetxt
+        CommContext._has_instance = None
+        CommContext._instance = None
+        comm_context = CommContext(cluster)
+
+        # Check AllreduceSumCost 128MB ring cost
+        allreduce_sum_op_desc = build_comm_desc(
+            "c_allreduce_sum",
+            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],
+            paddle.float32, [1, 32 * (10**6)])
+        allreduce_sum_op_cost = AllreduceSumOpCost(
+            op_desc=allreduce_sum_op_desc, comm_context=comm_context)
+
+        # Check AllgatherOpCost cost
+        allgather_op_desc = build_comm_desc(
+            "c_allgather",
+            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],
+            paddle.float32, [1, 32 * (10**6)])
+        allgather_op_cost = AllgatherOpCost(
+            op_desc=allgather_op_desc, comm_context=comm_context)
+        self.assertTrue(allgather_op_cost.time > 0)
+
+        # Check BroadcastOpCost cost
+        broadcast_op_desc = build_comm_desc(
+            "c_broadcast",
+            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],
+            paddle.float32, [1, 32 * (10**6)])
+        broadcast_op_cost = BroadcastOpCost(
+            op_desc=broadcast_op_desc, comm_context=comm_context)
+        self.assertTrue(broadcast_op_cost.time > 0)
+
+        # Check SendOpCost cost
+        send_op_desc = build_comm_desc("send_v2", [0, 1], paddle.float32,
+                                       [1, 32 * (10**6)])
+        send_op_cost = SendOpCost(
+            op_desc=send_op_desc, comm_context=comm_context)
+        self.assertTrue(send_op_cost.time > 0)
+
+        # Check RecvOpCost cost
+        recv_op_desc = build_comm_desc("recv_v2", [0, 1], paddle.float32,
+                                       [1, 32 * (10**6)])
+        recv_op_cost = RecvOpCost(
+            op_desc=recv_op_desc, comm_context=comm_context)
+        self.assertTrue(recv_op_cost.time > 0)
+
+        # Remove unnecessary files
+        if os.path.exists(cluster_json_path):
+            os.remove(cluster_json_path)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/python/paddle/fluid/tests/unittests/auto_parallel/test_new_cost_model.py b/python/paddle/fluid/tests/unittests/auto_parallel/test_new_cost_model.py
index 6d6fbfe78e9e6d9a94a1accb53daa84ffcacd654..c0df01ada58f9feb26a61b379d96bb4b675f2e24 100644
--- a/python/paddle/fluid/tests/unittests/auto_parallel/test_new_cost_model.py
+++ b/python/paddle/fluid/tests/unittests/auto_parallel/test_new_cost_model.py
@@ -13,12 +13,17 @@
 # limitations under the License.
 
 import unittest
+import os
+import json
 
 import paddle
 import paddle.distributed.auto_parallel.cost as cost_model
 from paddle.distributed.auto_parallel.cost.base_cost import parse_to_desc
 from paddle.distributed.auto_parallel.cost.base_cost import parse_desc_to_str
 from paddle.distributed.auto_parallel.cost.base_cost import calc_time_by_modeling
+from paddle.distributed.auto_parallel.cluster import Cluster
+from paddle.distributed.auto_parallel.cost import CommContext
+from test_cluster import cluster_json, multi_cluster_json
 
 paddle.enable_static()
 
@@ -58,14 +63,31 @@ class TestCost(unittest.TestCase):
         self.assertEqual(tensor_cost.cost.memory, 1600)
 
     def test_comm_cost(self):
+        # Build cluster
+        file_dir = os.path.dirname(os.path.abspath(__file__))
+        cluster_json_path = os.path.join(file_dir, "auto_parallel_cluster.json")
+        cluster_json_object = json.loads(cluster_json)
+        with open(cluster_json_path, "w") as cluster_json_file:
+            json.dump(cluster_json_object, cluster_json_file)
+        cluster = Cluster()
+        cluster.build_from_file(cluster_json_path)
+
+        # Build CommConetxt
+        CommContext._has_instance = None
+        CommContext._instance = None
+        comm_context = CommContext(cluster)
         desc = {}
         desc["op"] = "c_allreduce_sum"
-        desc["inputs"] = {"X": [([100, 200], paddle.float32)]}
+        desc["inputs"] = {"X": [(paddle.float32, [100, 200])]}
         desc["group_ranks"] = [0, 1]
         allreduce_cost = cost_model._g_op_cost_factory["c_allreduce_sum"](
-            op_desc=desc)
+            op_desc=desc, comm_context=CommContext(cluster))
         self.assertTrue(check_cost(allreduce_cost.cost))
 
+        # Remove unnecessary files
+        if os.path.exists(cluster_json_path):
+            os.remove(cluster_json_path)
+
     def test_cost_estimator(self):
         train_program = paddle.static.Program()
         cost_estimator = cost_model.CostEstimator(train_program)