diff --git a/config.json b/config.json
index cce834a..d7354f1 100644
--- a/config.json
+++ b/config.json
@@ -1,7 +1,7 @@
 {
   "id": "miku",
   "listen_port": 3900,
-  "listen_addr": "127.0.0.1",
+  "listen_ip": "127.0.0.1",
   "listen_num": 39,
-  "recv_buff": 4096
+  "buffsize": 4096
 }
\ No newline at end of file
diff --git a/mswp.py b/mswp.py
index b43708c..3cf6fe4 100644
--- a/mswp.py
+++ b/mswp.py
@@ -1,15 +1,34 @@
 import os
 from config import jsondata
 
+'''
+A datapack must like:
+---------------------
+post log msw/1.0
+id: miku
+flag: 1a2b3c4d
+length: 0
+from: hatsune
+to: [if has]
+filename: [if has]
+
+[data content here
+if has
+support many lines...]
+---------------------
+'''
+
 class Datapack:
-    def __init__(self, method='post', app='all', version='msw/1.0', head=None, body=b'', check_head=True, file=None):
-        self.id = jsondata.try_to_read_jsondata('id', 'Unknown_id')
+    def __init__(self, method='post', app='all', version='msw/0.1', head=None, body=b'', 
+    check_head=True, file=None):
+        self.id = jsondata.try_to_read_jsondata('id', 'unknown_id')
         if head is None:
             head = {}
             self.head = head
         else:
             self.head = head
-        self.head['id'] = self.id
+        if self.id == 'unknown_id':
+            self.head['id'] = self.id
         self.method = method
         self.file = file
         self.app = app
@@ -49,6 +68,5 @@ class Datapack:
             self.head[i] = ii
         if only_head:
             return self.encode_data[index+2:]
-
-
-dp = Datapack()
+        else:
+            return None
diff --git a/plugins/input.py b/plugins/input.py
index 68eb346..fe4c256 100644
--- a/plugins/input.py
+++ b/plugins/input.py
@@ -12,7 +12,7 @@ def main():
         file_flag = False
         raw_data = input()
 
-        if raw_data[:6] == '(file)':
+        if raw_data[:6] == '(file)': # like "(file)log: filename.exe"
             raw_data = raw_data[6:]
             file_flag = True
 
@@ -40,7 +40,7 @@ def find_the_last(indata):  # find the last ":" index
         try:
             next_index = indata[first_index+1:].index(':')
             first_index += next_index + 1
-        except Exception as e:
+        except:
             break
     last_index = copy.copy(first_index)
     last_index += 1
diff --git a/plugins/net.py b/plugins/net.py
index e624e00..635fdf9 100644
--- a/plugins/net.py
+++ b/plugins/net.py
@@ -1,5 +1,6 @@
 import threading
 import socket
+import copy
 import queue
 import os
 from mswp import Datapack
@@ -7,293 +8,157 @@ from forwarder import receive_queues, send_queue
 from config import jsondata
 receive_queue = receive_queues[__name__]
 
-RECV_BUFF = jsondata.try_to_read_jsondata('recv_buff', 4096)
+BUFFSIZE = jsondata.try_to_read_jsondata('buffsize', 4096)
 ID = jsondata.try_to_read_jsondata('id', 'Unknown_ID')
 
 def main():
-    netrecv = Netrecv()
-    while True:
-        dp = receive_queue.get()
-        dp.encode()
-        netrecv.send_queue.put(dp)
+    network_controller = Network_controller()
+    network_controller.start_accpet_connection()
+    
 
 
-def connect(addr):
-    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    s.connect(addr)
-    return s
-
-
-def process_hostname(hostname):
-    ip = socket.gethostbyname(hostname)
-    return ip
-
-
-def read_netlisttxt_file():
-    try:
-        with open('netlist.txt', 'r') as f:
-            raw_data = f.read()
-            return raw_data
-    except Exception as e:
-        print('Error: %s, %s\n'
-              'If you are the first time to run this program, \n'
-              'Please use "netlist_sample.txt" to create "netlist.txt", \n'
-              'Program will continue...' % (type(e), str(e)))
-        return ''
-
-
-class Netrecv:
+class Network_controller: # manage id and connection
     def __init__(self):
-        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  # initial socket, bind and listen, start to accept
-        addr = jsondata.try_to_read_jsondata('listen_addr', '127.0.0.1')
-        port = jsondata.try_to_read_jsondata('listen_port', 3900)
-        print('MSW now trying to bind the network %s, please allow it' % str((addr, port)))
-        s.bind((addr, port))
+        self.send_queue = queue.Queue()
+        self.id_dict = {}
+        self.lock = threading.Lock()
+        self.all_connection_list = []
+
+        #self.start_accpet_connection_thread = threading.Thread(target=self.start_accpet_connection, args=())
+        #self.start_accpet_connection_thread.start()
+    
+    def start_accpet_connection(self):
+        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+
+        listen_ip = jsondata.try_to_read_jsondata('listen_ip', '127.0.0.1')
+        listen_port = jsondata.try_to_read_jsondata('listen_port', 3900)
+        s.bind((listen_ip, listen_port))
+
         listen_num = jsondata.try_to_read_jsondata('listen_num', 39)
         s.listen(listen_num)
-        self.s = s
-        self.stat = {}  # # # # #
-        self.connection_list = []  # [(conn, addr), (conn, addr)...] Very important
-        self.connection_process_thread_list =[]
-        self.un_enougth_list = []
-        self.send_queue = queue.Queue()
 
-        self.thread_check_accept_connection = threading.Thread(target=self.check_accept_connection, args=())
-        self.thread_check_send_queue = threading.Thread(target=self.check_send_queue, args=())
+        print('Sucessfully listen at %s:%s, max connection:%s' % (listen_ip, listen_port, listen_num))
 
-        ########################################
-
-        raw_data = read_netlisttxt_file()  # read file
-        lines = raw_data.split('\n')
-        self.file_addr_list = []
-        for line in lines:
-            ip_port = line.split(':')
-            if len(ip_port) == 1:
-                ip = ip_port[0]
-                if not ip:  # Check whether ip is null
-                    continue
-                port = jsondata.get('listen_port')
-                if not port:
-                    port = 3900
-            ip = process_hostname(ip_port[0])
-            port = int(ip_port[1])
-            self.file_addr_list.append((ip, port))
-
-        for addr in self.file_addr_list:  # Create connection
-            conn = connect(addr)
-            self.connection_list.append((conn, addr))
-
-            # Create receive thread and start
-            connection_thread = threading.Thread(target=self.process_connection, args=(conn, addr))
-            self.connection_process_thread_list.append(connection_thread)
-            connection_thread.start()
-
-        self.thread_check_accept_connection.start()
-        self.thread_check_send_queue.start()
-
-    def check_send_queue(self):
         while True:
-            dp = receive_queue.get()
+            conn, addr = s.accept()
+            connection = Connection(conn, addr, self)
 
-            # debug code
-            if dp.body == b'stat':
-                print(self.stat)
-                continue
+            self.all_connection_list.append(connection)
 
-            if dp.method == 'file':
-                print('right')
-                print(dp.head)
-                dp.encode()
-                for id in self.stat:
-                    for conn, addr in self.stat[id]:
-                        conn.sendall(dp.encode_data)
-                        file = open(dp.head['filename'], 'rb')
-                        for data in file:
-                            conn.send(data)
-                        print('sended')
 
-            else:
-                print('wrong')
-                dp.encode()
-                for id in self.stat:
-                    for conn, addr in self.stat[id]:
-                        conn.sendall(dp.encode_data)
+    def set_connection(self, id, conn):
+        with self.lock:
+            if not self.id_dict.get(id):
+                self.id_dict[id] = []
+            self.id_dict[id].append(conn)
+
+
+    def del_connection(self, id, conn):
+        with self.lock:
+            if id in self.id_dict:
+                if not self.id_dict.get(id): # if id has no connection
+                    del(self.id_dict[id])
+                else:
+                    self.id_dict[id].remove(conn)
+            self.all_connection_list.remove(conn)
+
+            
+
+class Connection:
+    def __init__(self, conn, addr, netowrk_controller):
+        self.conn = conn
+        self.addr = addr
+        self.netowrk_controller = netowrk_controller
+        self.id = None
+        self.buff = b''
+
+        self.thread = threading.Thread(target=self._init, args=())
+        self.thread.start()
+
+
+    def _init(self): # init to check connection id, threading
+        err_code = self.check_id()
+        if err_code:
+            print('Init connection failed, connection closed')
+            self.conn.close()
+
+        self.netowrk_controller.set_connection(self.id, self.conn)
+        
+        self.receive()
+
+
+    def receive(self):
+        still_need = 0
 
-    def check_accept_connection(self):
         while True:
-            conn, addr = self.s.accept()
-            self.connection_list.append((conn, addr))  # # # # #
-            connection_thread = threading.Thread(target=self.process_connection, args=(conn, addr))
-            self.connection_process_thread_list.append(connection_thread)
-            connection_thread.start()
-
-    def remove_connection(self, conn, addr):
-        conn.close()
-        for id in self.stat:
-            if (conn, addr) in self.stat[id]:
-                self.stat[id].remove((conn, addr))
-        self.connection_list.remove((conn, addr))
-        print('Removed connection', str(addr))
-
-    def say_hello(self, conn, addr):
-        dp = Datapack(head={'from': __name__})
-        dp.app = 'net'
-        dp.encode()
-        conn.sendall(dp.encode_data)
-        print('hello package has been sent')
-
-    def process_connection(self, conn, addr):
-        self.say_hello(conn, addr)
-
-        print('Connection accept %s' % str(addr))
-        data = b''
-        while True:
-            try:
-                new_data = conn.recv(RECV_BUFF)
-            except ConnectionResetError:
-                print('Connection Reset Error')
-                self.remove_connection(conn, addr)
-                return
-
-            if not new_data and not data:
-                self.remove_connection(conn, addr)
-                print('return 1')
-                return
-            data += new_data
-
-            while True:
-
-                # try unpack #
-                dp = Datapack(check_head=False)
-                dp.encode_data = data
-                print('data', data)
+            print(still_need)
+            data = self.conn.recv(BUFFSIZE)
+            if not data:
+                break
+            self.buff += data
+            
+            if not still_need:
+                dp = Datapack()
+                dp.encode_data = self.buff
                 try:
-                    if data:
-                        data = dp.decode(only_head=True)
-                        print('decode success')
-                    else:
-                        print('Null data')
-                        break
+                    self.buff = dp.decode(only_head=True)
+
+                    if dp.method == 'file' and os.path.exists(dp.head['filename']):
+                        os.remove(dp.head['filename'])
+                        
                 except Exception as e:
-                    print('Decode error %s: %s' % (type(e), str(e)))
-                    break
-                # try unpack #
-
-                # net config data package
-                if dp.app == 'net':
-
-                    dp_id = dp.head['id']
-                    local_id = self.stat.get(dp_id)
-
-                    if not local_id:  # create if not exits
-                        self.stat[dp_id] = []
-
-                    if not (conn, addr) in self.stat[dp_id]:
-                        self.stat[dp_id].append((conn, addr))
-
+                    print('Decode head failed %s: %s' % (type(e), str(e)))
                     continue
 
+                length = int(dp.head.get('length'))
+                still_need = length
+            
+            if still_need <= len(self.buff): # first download complete setuation
                 if dp.method == 'file':
-                    length = int(dp.head['length'])
-                    data_length = len(data)
+                    with open(dp.head['filename'], 'ab') as f:
+                        f.write(self.buff[:still_need])
+                else:
+                    dp.body = self.buff[:still_need]
+                    self.buff = self.buff[still_need:]
+                still_need = 0
+            else: # writing tmp data
+                if dp.method == 'file':
+                    with open(dp.head['filename'], 'ab') as f:
+                        still_need -= f.write(self.buff)
+                else:
+                    dp.body += self.buff
+                    still_need -= len(self.buff)
+                self.buff = b'' # empty buff because all tmp data has been write
 
-                    # 3 condition
-                    if length == data_length:
-                        file = open(dp.head['filename'], 'wb')
-                        file.write(data)
-                        data = b''
-                        # return package needed
 
-                    elif length > data_length:
-                        file = open(dp.head['filename'], 'wb')
-                        aleady_write_down = 0
-                        file.write(data)
-                        aleady_write_down += len(data)
-                        data = b''
+        
+        # below code are using to closed connection
+        self.conn.close()
 
-                        while aleady_write_down < length:
-                            new_data = conn.recv(RECV_BUFF)
-                            if not new_data:
-                                print('return 22')
-                                return
+        
+    def check_id(self):
+        '''
+        return code
+        0 ok
+        1 unknown id
+        2 connection closed
+        '''
 
-                            new_data_size = len(new_data)
-                            still_need = length - aleady_write_down
-                            print(still_need)
+        data = self.conn.recv(BUFFSIZE)
+        if not data:
+            return 2
 
-                            if new_data_size == still_need:  # 3 condition of new_data
-                                print('right')
-                                file.write(new_data)
-                                aleady_write_down += new_data_size
+        self.buff += data
+        dp = Datapack()
+        dp.encode_data = self.buff # maybe here needs to use copy.copy(self.buff)
+        self.buff = dp.decode(only_head=True)
+        if not dp.head.get('id'):
+            return 1
+        self.id = dp.head['id']
 
-                            elif new_data_size < still_need:
-                                file.write(new_data)
-                                aleady_write_down += new_data_size
 
-                            elif new_data_size > still_need:
-                                file.write(new_data[:still_need])
-                                aleady_write_down += still_need
-                                data = new_data[still_need:]
-
-                    else:
-                        file = open(dp.head['filename'], 'wb')
-                        file.write(data[:length])
-                        data = data[length:]
-
-                    file.close()
-                    dp.encode_data = b''
-                    send_queue.put(dp)
-
-                else:  # normal data pack
-                    length = int(dp.head['length'])
-                    data_length = len(data)
-
-                    # 3 condition
-                    if length == data_length:
-                        print('=')
-                        dp.body = data
-                        data = b''
-
-                    elif length > data_length:
-                        while data_length < length:
-                            new_data = conn.recv(RECV_BUFF)
-                            if not new_data:
-                                print('return 2')
-                                return
-
-                            new_data_size = len(new_data)
-                            still_need = length - data_length
-                            print(still_need)
-
-                            if new_data_size == still_need:
-                                print('data', data)
-                                print('net_data', new_data)
-                                data += new_data
-                                data_length = len(data)
-                                dp.body = data
-                                data = b''
-
-                            elif new_data_size < still_need:
-                                print('data', data)
-                                print('net_data', new_data)
-                                data += new_data
-                                data_length = len(data)
-
-                            else:
-                                print('else')
-                                data += new_data[:still_need]
-                                new_data = new_data[still_need:]
-                                data_length = len(data)
-                                dp.body = data
-                                data = new_data
-
-                    else:
-                        dp.body = data[:length]
-                        data = data[length:]
-
-                    dp.encode()
-                    send_queue.put(dp)
-                    print('###############\n' + dp.encode_data.decode() + '\n###############')
+    def sendall(self, data):
+        self.conn.sendall(data)
 
 
 thread = threading.Thread(target=main, args=())
diff --git a/test_file.py b/test_file.py
index 00c3f8c..08ffc19 100644
--- a/test_file.py
+++ b/test_file.py
@@ -1,7 +1,13 @@
 import socket
 import time
 
-data = '''file log msw/1.0
+data = '''post id msw/0.1
+id: miku
+length: 0
+from: test_software
+flag: 1a2b3c4d
+
+file log msw/1.0
 from: network
 flag: abcdefgh
 filename: download.txt
@@ -30,6 +36,9 @@ for i in data_list:
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 s.connect(('127.0.0.1', 3900))
 
+n=0
 for i in code_list:
+    n+=1
     s.sendall(i)
+    print('发送%s' % n)
     time.sleep(1)
\ No newline at end of file