diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index a49f0813..3f2749b6 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -8,6 +8,7 @@ local pcall = pcall
 local table = table
 local tremove = table.remove
 local tinsert = table.insert
+local traceback = debug.traceback
 
 local profile = require "skynet.profile"
 
@@ -773,7 +774,7 @@ function skynet.task(ret)
 	local tt = type(ret)
 	if tt == "table" then
 		for session,co in pairs(session_id_coroutine) do
-			ret[session] = debug.traceback(co)
+			ret[session] = traceback(co)
 		end
 		return
 	elseif tt == "number" then
@@ -793,6 +794,30 @@ function skynet.task(ret)
 	end
 end
 
+function skynet.uniqtask()
+	local stacks = {}
+	for session, co in pairs(session_id_coroutine) do
+		local stack = traceback(co)
+		local info = stacks[stack] or {count = 0, sessions = {}}
+		info.count = info.count + 1
+		if info.count < 10 then
+			info.sessions[#info.sessions+1] = session
+		end
+		stacks[stack] = info
+	end
+	local ret = {}
+	for stack, info in pairs(stacks) do
+		local count = info.count
+		local sessions = table.concat(info.sessions, ",")
+		if count > 10 then
+			sessions = sessions .. "..."
+		end
+		local head_line = string.format("%d\tsessions:[%s]\n", count, sessions)
+		ret[head_line] = stack
+	end
+	return ret
+end
+
 function skynet.term(service)
 	return _error_dispatch(0, service)
 end
diff --git a/lualib/skynet/debug.lua b/lualib/skynet/debug.lua
index e2027950..78fd1a16 100644
--- a/lualib/skynet/debug.lua
+++ b/lualib/skynet/debug.lua
@@ -42,6 +42,10 @@ local function init(skynet, export)
 			end
 		end
 
+		function dbgcmd.UNIQTASK()
+			skynet.ret(skynet.pack(skynet.uniqtask()))
+		end
+
 		function dbgcmd.INFO(...)
 			if internal_info_func then
 				skynet.ret(skynet.pack(internal_info_func(...)))
diff --git a/service/debug_console.lua b/service/debug_console.lua
index 2ed44f79..07572bbb 100644
--- a/service/debug_console.lua
+++ b/service/debug_console.lua
@@ -148,6 +148,7 @@ function COMMAND.help()
 		clearcache = "clear lua code cache",
 		service = "List unique service",
 		task = "task address : show service task detail",
+		uniqtask = "task address : show service unique task detail",
 		inject = "inject address luascript.lua",
 		logon = "logon address",
 		logoff = "logoff address",
@@ -262,6 +263,11 @@ function COMMAND.task(address)
 	return skynet.call(address,"debug","TASK")
 end
 
+function COMMAND.uniqtask(address)
+	address = adjust_address(address)
+	return skynet.call(address,"debug","UNIQTASK")
+end
+
 function COMMAND.info(address, ...)
 	address = adjust_address(address)
 	return skynet.call(address,"debug","INFO", ...)