diff --git a/lualib/mcgroup.lua b/lualib/mcgroup.lua
index a6d74d55..be566544 100644
--- a/lualib/mcgroup.lua
+++ b/lualib/mcgroup.lua
@@ -24,12 +24,12 @@ function group.leave(id, handle)
 end
 
 function group.release(id)
-	skynet.send(SERVICE, "lua" , "CLEAR", skynet.self(), id)
+	skynet.send(SERVICE, "lua" , "DELETE", skynet.self(), id)
 end
 
 skynet.init(function()
 	SERVICE = skynet.call("SERVICE", "lua", "group_mgr")
-	skynet.call(".service","lua","group_agent")
-end, "group")
+	skynet.call(".service","lua","group_agent", SERVICE)
+end, "mcgroup")
 
-return group
\ No newline at end of file
+return group
diff --git a/service/group_agent.lua b/service/group_agent.lua
index 386a7785..84d11764 100644
--- a/service/group_agent.lua
+++ b/service/group_agent.lua
@@ -1,5 +1,9 @@
 local skynet = require "skynet"
 
+local group_mgr = ...
+
+group_mgr = tonumber(group_mgr)
+
 local command = {}
 local group = {}
 
@@ -52,5 +56,5 @@ skynet.start(function()
 		assert(f, cmd)
 		f(id,handle)
 	end)
-	skynet.send("GROUPMGR" , "lua", "MASTER", skynet.self())
+	skynet.send(group_mgr , "lua", "MASTER", skynet.self())
 end)
diff --git a/service/group_mgr.lua b/service/group_mgr.lua
index ba6b9bd1..edb5a906 100644
--- a/service/group_mgr.lua
+++ b/service/group_mgr.lua
@@ -12,9 +12,12 @@ end
 local function create_group_in(harbor, id)
 	local local_ctrl = assert(harbor_ctrl[harbor])
 	local g = multicast[id]
+	g[harbor] = false
 	local local_mc = skynet.call(local_ctrl, "lua", "CREATE", id)
 	for _,mc in pairs(g) do
-		skynet.send(local_ctrl, "lua", "AGENT", id, mc)
+		if mc then
+			skynet.send(local_ctrl, "lua", "AGENT", id, mc)
+		end
 	end
 	for harbor_id,ctrl in pairs(harbor_ctrl) do
 		if harbor_id ~= harbor then
@@ -42,15 +45,13 @@ function command.ENTER(address, harbor, id)
 end
 
 function command.LEAVE(address, harbor, id)
-	local g = multicast[id]
-	assert(g,id)
+	assert(multicast[id], id)
 	local local_ctrl = assert(harbor_ctrl[harbor])
 	skynet.send(local_ctrl, "lua", "LEAVE", id, address)
 end
 
 function command.DELETE(_,_, id)
-	local g = multicast[id]
-	assert(g,id)
+	assert(multicast[id], id)
 	multicast[id] = nil
 
 	for harbor_id,_ in pairs(g) do
@@ -59,12 +60,11 @@ function command.DELETE(_,_, id)
 end
 
 skynet.start(function()
-	skynet.dispatch("lua", function(_, _, cmd , address, param)
+	skynet.dispatch("lua", function(_, _, cmd, address, param)
 		local f = command[cmd]
 		assert(f, cmd, param)
 		local harbor = skynet.harbor(address)
 		f(address, harbor, param)
 	end)
-	skynet.register("GROUPMGR")
 end)