diff --git a/db_transfer.py b/db_transfer.py
index f31a5d7..de0a481 100644
--- a/db_transfer.py
+++ b/db_transfer.py
@@ -41,16 +41,14 @@ class TransferBase(object):
 				dt_transfer[id] = [self.last_get_transfer[id][0] - last_transfer[id][0], self.last_get_transfer[id][1] - last_transfer[id][1]]
 
 		for id in curr_transfer.keys():
+			if id in self.force_update_transfer:
+				continue
 			#算出与上次记录的流量差值，保存于dt_transfer表
 			if id in last_transfer:
 				if curr_transfer[id][0] + curr_transfer[id][1] - last_transfer[id][0] - last_transfer[id][1] <= 0:
 					continue
-				if last_transfer[id][0] <= curr_transfer[id][0] and \
-						last_transfer[id][1] <= curr_transfer[id][1]:
-					dt_transfer[id] = [curr_transfer[id][0] - last_transfer[id][0],
-										curr_transfer[id][1] - last_transfer[id][1]]
-				else:
-					dt_transfer[id] = [curr_transfer[id][0], curr_transfer[id][1]]
+				dt_transfer[id] = [curr_transfer[id][0] - last_transfer[id][0],
+								curr_transfer[id][1] - last_transfer[id][1]]
 			else:
 				if curr_transfer[id][0] + curr_transfer[id][1] <= 0:
 					continue
@@ -67,14 +65,16 @@ class TransferBase(object):
 
 		update_transfer = self.update_all_user(dt_transfer) #返回有更新的表
 		for id in update_transfer.keys(): #其增量加在此表
-			if id in self.force_update_transfer: #但排除在force_update_transfer内的
-				if id in self.last_update_transfer:
-					del self.last_update_transfer[id]
-				self.force_update_transfer.remove(id)
-			else:
+			if id not in self.force_update_transfer: #但排除在force_update_transfer内的
 				last = self.last_update_transfer.get(id, [0,0])
 				self.last_update_transfer[id] = [last[0] + update_transfer[id][0], last[1] + update_transfer[id][1]]
 		self.last_get_transfer = curr_transfer
+		for id in self.force_update_transfer:
+			if id in self.last_update_transfer:
+				del self.last_update_transfer[id]
+			if id in self.last_get_transfer:
+				del self.last_get_transfer[id]
+		self.force_update_transfer = set()
 
 	def del_server_out_of_bound_safe(self, last_rows, rows):
 		#停止超流量的服务
@@ -117,6 +117,7 @@ class TransferBase(object):
 				if not allow:
 					logging.info('db stop server at port [%s]' % (port,))
 					ServerPool.get_instance().cb_del_server(port)
+					self.force_update_transfer.add(port)
 				else:
 					cfgchange = False
 					if port in ServerPool.get_instance().tcp_servers_pool:
@@ -135,6 +136,7 @@ class TransferBase(object):
 					if cfgchange:
 						logging.info('db stop server at port [%s] reason: config changed: %s' % (port, cfg))
 						ServerPool.get_instance().cb_del_server(port)
+						self.force_update_transfer.add(port)
 						new_servers[port] = (passwd, cfg)
 
 			elif allow and ServerPool.get_instance().server_run_status(port) is False:
@@ -146,6 +148,7 @@ class TransferBase(object):
 			else:
 				logging.info('db stop server at port [%s] reason: port not exist' % (row['port']))
 				ServerPool.get_instance().cb_del_server(row['port'])
+				self.clear_cache(row['port'])
 				if row['port'] in self.port_uid_table:
 					del self.port_uid_table[row['port']]
 
@@ -156,13 +159,17 @@ class TransferBase(object):
 				passwd, cfg = new_servers[port]
 				self.new_server(port, passwd, cfg)
 
+	def clear_cache(self, port):
+		if port in self.force_update_transfer: del self.force_update_transfer[port]
+		if port in self.last_get_transfer: del self.last_get_transfer[port]
+		if port in self.last_update_transfer: del self.last_update_transfer[port]
+
 	def new_server(self, port, passwd, cfg):
 		protocol = cfg.get('protocol', ServerPool.get_instance().config.get('protocol', 'origin'))
 		method = cfg.get('method', ServerPool.get_instance().config.get('method', 'None'))
 		obfs = cfg.get('obfs', ServerPool.get_instance().config.get('obfs', 'plain'))
 		logging.info('db start server at port [%s] pass [%s] protocol [%s] method [%s] obfs [%s]' % (port, passwd, protocol, method, obfs))
 		ServerPool.get_instance().new_server(port, cfg)
-		self.force_update_transfer.add(port)
 
 	def cmp(self, val1, val2):
 		if type(val1) is bytes:
@@ -230,7 +237,7 @@ class DbTransfer(TransferBase):
 			"user": "ss",
 			"password": "pass",
 			"db": "shadowsocks",
-			"node_id": 1,
+			"node_id": 0,
 			"transfer_mul": 1.0,
 			"ssl_enable": 0,
 			"ssl_ca": "",
@@ -261,8 +268,9 @@ class DbTransfer(TransferBase):
 		for id in dt_transfer.keys():
 			transfer = dt_transfer[id]
 			#小于最低更新流量的先不更新
-			update_trs = 1024 * max(2048 - self.user_pass.get(id, 0) * 64, 16)
-			if transfer[0] + transfer[1] < update_trs:
+			update_trs = 1024 * (2048 - self.user_pass.get(id, 0) * 64)
+			if transfer[0] + transfer[1] < update_trs and id not in self.force_update_transfer:
+				self.user_pass[id] = self.user_pass.get(id, 0) + 1
 				continue
 			if id in self.user_pass:
 				del self.user_pass[id]
@@ -372,7 +380,7 @@ class Dbv3Transfer(DbTransfer):
 			transfer = dt_transfer[id]
 			bandwidth_thistime = bandwidth_thistime + transfer[0] + transfer[1]
 
-			update_trs = 1024 * max(2048 - self.user_pass.get(id, 0) * 64, 16)
+			update_trs = 1024 * (2048 - self.user_pass.get(id, 0) * 64)
 			if transfer[0] + transfer[1] < update_trs:
 				self.user_pass[id] = self.user_pass.get(id, 0) + 1
 				continue