diff --git a/dubbo/codec/decoder.py b/dubbo/codec/decoder.py
index 4b2c3d6..085b0c5 100644
--- a/dubbo/codec/decoder.py
+++ b/dubbo/codec/decoder.py
@@ -416,9 +416,9 @@
         return str(self.__data)
 
 
-def get_body_length(response_head):
+def parse_response_head(response_head):
     """
-    计算出响应体的长度
+    对响应头部的字节做解析
     :param response_head:
     :return:
     """
diff --git a/dubbo/codec/encoder.py b/dubbo/codec/encoder.py
index 7942a44..49aee4d 100644
--- a/dubbo/codec/encoder.py
+++ b/dubbo/codec/encoder.py
@@ -167,6 +167,11 @@
 
     @staticmethod
     def _encode_bool(value):
+        """
+        对bool类型进行编码
+        :param value:
+        :return:
+        """
         result = []
         if value:
             result.append(ord('T'))
@@ -176,8 +181,14 @@
 
     @staticmethod
     def _encode_int(value):
+        """
+        对整数进行编码
+        :param value:
+        :return:
+        """
         result = []
         # 超出int类型范围的值则转化为long类型
+        # 这里问题在于对于落在int范围内的数字，我们无法判断其是long类型还是int类型，所以一律认为其是int类型
         if value > MAX_INT_32 or value < MIN_INT_32:
             result.append(ord('L'))
             result.extend(list(bytearray(struct.pack('!q', value))))
@@ -202,6 +213,11 @@
 
     @staticmethod
     def _encode_float(value):
+        """
+        对浮点类型进行编码
+        :param value:
+        :return:
+        """
         result = []
         int_value = int(value)
         if int_value == value:
@@ -265,6 +281,11 @@
         return result
 
     def _encode_str(self, value):
+        """
+        对一个字符串进行编码
+        :param value:
+        :return:
+        """
         result = []
         # 在进行网络传输操作时一律使用unicode进行操作
         if isinstance(value, str):
@@ -284,6 +305,11 @@
         return result
 
     def _encode_object(self, value):
+        """
+        对一个对象进行编码
+        :param value:
+        :return:
+        """
         result = []
         path = value.get_path()
         field_names = value.keys()
@@ -310,6 +336,11 @@
         return result
 
     def _encode_list(self, value):
+        """
+        对一个列表进行编码
+        :param value:
+        :return:
+        """
         result = []
         length = len(value)
         if length == 0:
@@ -373,6 +404,7 @@
         # 列表(list)类型，不可以使用tuple替代
         elif isinstance(value, list):
             return self._encode_list(value)
+        # null
         elif value is None:
             return [ord('N')]
         else:
diff --git a/dubbo/connection/connections.py b/dubbo/connection/connections.py
index 8fa38e3..9f6ca83 100644
--- a/dubbo/connection/connections.py
+++ b/dubbo/connection/connections.py
@@ -7,7 +7,7 @@
 from struct import unpack, pack
 
 from dubbo.codec.encoder import Request
-from dubbo.codec.decoder import Response, get_body_length
+from dubbo.codec.decoder import Response, parse_response_head
 from dubbo.common.constants import CLI_HEARTBEAT_RES_HEAD, CLI_HEARTBEAT_TAIL, CLI_HEARTBEAT_REQ_HEAD, \
     TIMEOUT_CHECK_INTERVAL, TIMEOUT_IDLE, TIMEOUT_MAX_TIMES
 from dubbo.common.exceptions import DubboResponseException, DubboRequestTimeoutException
@@ -116,7 +116,7 @@
             return
 
         try:
-            heartbeat, body_length = get_body_length(head)
+            heartbeat, body_length = parse_response_head(head)
         except DubboResponseException as e:  # 这里是dubbo的内部异常，与response中的业务异常不一样
             logger.exception(e)
             body_length = unpack('!i', head[12:])[0]
@@ -298,7 +298,6 @@
         sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         sock.connect((host, port))
         self.__sock = sock
-        self.__lock = threading.Lock()
         # Event是Condition的简单实现版本
         self.__event = threading.Event()