diff --git a/python/paddle/fluid/distributed/ps_instance.py b/python/paddle/fluid/distributed/ps_instance.py
new file mode 100644
index 0000000000000000000000000000000000000000..b4045327e1b17b559a82c7fab811e7ef7adbc7b4
--- /dev/null
+++ b/python/paddle/fluid/distributed/ps_instance.py
@@ -0,0 +1,108 @@
+#import paddle.fluid.distributed.helper as dist_helper
+import helper as dist_helper
+import sys
+#from mpi4py import MPI
+
+
+class PaddlePSInstance(object):
+    def __init__(self, init_param, server_worker_mode, proc_per_node):
+        self.dh = dist_helper.MPIHelper()
+        self._config = init_param
+        self._rankid = self.dh.get_rank()
+        self._server_worker_mode = server_worker_mode
+        self._proc_per_node = proc_per_node
+        self._nodes = self.dh.get_size()
+        
+        self._ip = 0
+        self._worker_num = self._nodes * self._proc_per_node / 2
+        self._server_num = self._nodes * self._proc_per_node / 2
+        self._total_server_worker = self._worker_num + self._server_num
+        self._node_type = None #IDLE=-1, WORKER=1, SERVER=0
+        self._set_nodetype()
+        self._comm = None
+        self._split_comm()
+        
+
+    def _set_nodetype(self):
+        if self._server_worker_mode == 0:
+            if self._rankid < self._server_num: 
+                self._node_type = 1
+            elif self._rankid < self._total_server_worker:
+                self._node_type = 0
+            else:
+                self._node_type = -1
+        elif self._server_worker_mode == 1:
+            if self._rankid < self._total_server_worker:
+                if 0 == self._rankid % self._proc_per_node % 2:
+                    self._node_type = 0
+                else:
+                    self._node_type = 1
+            else: 
+                self._node_type = -1;
+        else:
+            self._node_type = -1
+            
+        #if self._rankid == 0:
+            #print "node type: ", self._node_type
+
+    def _split_comm(self):
+        if self.is_server():
+            self._comm = self.dh.comm.Split(self._node_type)
+        elif self.is_worker():
+            self._comm = self.dh.comm.Split(self._node_type)
+        pass
+
+    def get_worker_index(self):
+        if self._server_worker_mode == 0:
+            return self._rankid == self.server_num
+        else:
+            return self._rankid / self._proc_per_node
+
+    def get_server_index(self):
+        if self._server_worker_mode == 0:
+            return self.rank_id
+        else:
+            return self.rank_id / self._proc_per_node
+
+    def is_worker(self):
+        return self._node_type == 1
+
+    def is_server(self):
+        return self._node_type == 0
+
+    def is_first_worker(self):
+        return self.is_worker() and 0 == self.get_worker_index()
+
+    def set_ip(self, ip):
+        self._ip = ip
+
+    def gather_ips(self):
+        self._ips = self.dh.comm.allgather(self._ip)
+        return self._ips
+
+    def get_node_cnt(self):
+        return self._nodes
+
+    def barrier_all(self):
+        #print self._rankid, "begin"
+        #sys.stdout.flush()
+        self.dh.comm.barrier()
+        #print self._rankid, "end"
+
+    def barrier_worker(self):
+        if self.is_worker():
+            #print "worker: ", self._rankid, "begin"
+            #sys.stdout.flush()
+            self._comm.barrier()
+            #print "worker: ", self._rankid, "end"
+        pass
+
+    def finalize(self):
+        pass
+
+
+if __name__ == "__main__":
+    instance = PaddlePSInstance(1, 1, 2, 50)
+    instance.barrier_all()
+    #print "-----" 
+    #instance.barrier_worker()