diff --git a/lualib-src/sproto/lsproto.c b/lualib-src/sproto/lsproto.c
index 42eccd8c..c33118d4 100644
--- a/lualib-src/sproto/lsproto.c
+++ b/lualib-src/sproto/lsproto.c
@@ -48,15 +48,9 @@ LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
 
 static int
 lnewproto(lua_State *L) {
-	size_t sz = 0;
-	void * buffer;
 	struct sproto * sp;
-	if (lua_isuserdata(L,1)) {
-		buffer = lua_touserdata(L,1);
-		sz = luaL_checkinteger(L,2);
-	} else {
-		buffer = (void *)luaL_checklstring(L,1,&sz);
-	}
+	size_t sz;
+	void * buffer = (void *)luaL_checklstring(L,1,&sz);
 	sp = sproto_create(buffer, sz);
 	if (sp) {
 		lua_pushlightuserdata(L, sp);
@@ -545,48 +539,38 @@ lprotocol(lua_State *L) {
 	return 3;
 }
 
-/* global sproto pointer for multi states */
-struct sproto_bin {
-	void *ptr;
-	size_t sz;
-};
-
-static struct sproto_bin G_sproto[MAX_GLOBALSPROTO];
+/* global sproto pointer for multi states
+   NOTICE : It is not thread safe
+ */
+static struct sproto * G_sproto[MAX_GLOBALSPROTO];
 
 static int
 lsaveproto(lua_State *L) {
-	size_t sz;
-	void * buffer = (void *)luaL_checklstring(L,1,&sz);
+	struct sproto * sp = lua_touserdata(L, 1);
 	int index = luaL_optinteger(L, 2, 0);
-	void * tmp;
-	struct sproto_bin * sbin = &G_sproto[index];
 	if (index < 0 || index >= MAX_GLOBALSPROTO) {
 		return luaL_error(L, "Invalid global slot index %d", index);
 	}
-	tmp = malloc(sz);
-	memcpy(tmp, buffer, sz);
-	if (sbin->ptr) {
-		free(sbin->ptr);
-	}
-	sbin->ptr = tmp;
-	sbin->sz = sz;
+	/* TODO : release old object (memory leak now, but thread safe)*/
+	G_sproto[index] = sp;
 	return 0;
 }
 
 static int
 lloadproto(lua_State *L) {
 	int index = luaL_optinteger(L, 1, 0);
-	struct sproto_bin * sbin = &G_sproto[index];
+	struct sproto * sp;
 	if (index < 0 || index >= MAX_GLOBALSPROTO) {
 		return luaL_error(L, "Invalid global slot index %d", index);
 	}
-	if (sbin->ptr == NULL) {
+	sp = G_sproto[index];
+	if (sp == NULL) {
 		return luaL_error(L, "nil sproto at index %d", index);
 	}
 
-	lua_pushlightuserdata(L, sbin->ptr);
-	lua_pushinteger(L, sbin->sz);
-	return 2;
+	lua_pushlightuserdata(L, sp);
+
+	return 1;
 }
 
 int
diff --git a/lualib/sproto.lua b/lualib/sproto.lua
index 4c285222..7a722f55 100644
--- a/lualib/sproto.lua
+++ b/lualib/sproto.lua
@@ -13,14 +13,23 @@ function sproto_mt:__gc()
 	core.deleteproto(self.__cobj)
 end
 
-function sproto.new(bin,sz,nogc)
-	local cobj = assert(core.newproto(bin,sz))
+function sproto.new(bin)
+	local cobj = assert(core.newproto(bin))
 	local self = {
 		__cobj = cobj,
 		__tcache = setmetatable( {} , weak_mt ),
 		__pcache = setmetatable( {} , weak_mt ),
 	}
-	return setmetatable(self, nogc and sproto_nogc or sproto_mt)
+	return setmetatable(self, sproto_mt)
+end
+
+function sproto.sharenew(cobj)
+	local self = {
+		__cobj = cobj,
+		__tcache = setmetatable( {} , weak_mt ),
+		__pcache = setmetatable( {} , weak_mt ),
+	}
+	return setmetatable(self, sproto_nogc)
 end
 
 function sproto.parse(ptext)
diff --git a/lualib/sprotoloader.lua b/lualib/sprotoloader.lua
index 05d17293..e88a9260 100644
--- a/lualib/sprotoloader.lua
+++ b/lualib/sprotoloader.lua
@@ -8,16 +8,19 @@ function loader.register(filename, index)
 	local f = assert(io.open(filename), "Can't open sproto file")
 	local data = f:read "a"
 	f:close()
-	local bin = parser.parse(data)
-	core.saveproto(bin, index)
+	local sp = core.newproto(parser.parse(data))
+	core.saveproto(sp, index)
 end
 
-loader.save = core.saveproto
+function loader.save(bin, index)
+	local sp = core.newproto(bin)
+	core.saveproto(sp, index)
+end
 
 function loader.load(index)
-	local bin, sz = core.loadproto(index)
+	local sp = core.loadproto(index)
 	--  no __gc in metatable
-	return sproto.new(bin,sz, true)
+	return sproto.sharenew(sp)
 end
 
 return loader