diff --git a/lua/lua.c b/lua/lua.c
index a418265..2222d40 100644
--- a/lua/lua.c
+++ b/lua/lua.c
@@ -92,7 +92,7 @@ static char *trim(char *str)
     return str;
 }
 
-static void print_number_fixed3(double num) 
+void print_number_fixed3(double num) 
 {
     if (NULL == lua_print) return;
 
diff --git a/lua/lua_base.h b/lua/lua_base.h
index 9a85c49..7ab7aa0 100644
--- a/lua/lua_base.h
+++ b/lua/lua_base.h
@@ -99,6 +99,8 @@ extern lua_output lua_print;
  *      routines' or functions' implementations *
  *----------------------------------------------*/
 int lua_init(lua_output _lua_print);
+/* 拆分整数/小数部分打印浮点数（保留小数点后三位），不依赖 printf 的 %f/%g（适用于无浮点打印支持的平台） */
+void print_number_fixed3(double num);
 int lua_repl(char *_pcBuffer, int _iSize, int _iEcho);
 void luaprint_stdout(const char *fmt, ...); 
 void lua_register_help(lua_State *L, const char *name, lua_CFunction func, const char *description);
diff --git a/lua/pb_lua.c b/lua/pb_lua.c
index 1fc7369..271d507 100644
--- a/lua/pb_lua.c
+++ b/lua/pb_lua.c
@@ -357,7 +357,7 @@ static void pb_lua_dump_msg_fields(const void *msg, const pb_lua_msg_t *m, int d
             case PB_LUA_T_DOUBLE: {
                 double v;
                 memcpy(&v, p, sizeof(v));
-                lua_print("%g", v);
+                print_number_fixed3(v);
                 break;
             }
             case PB_LUA_T_STRING: {
@@ -424,7 +424,7 @@ static void pb_lua_dump_table_fields(lua_State *L, int tidx, const pb_lua_msg_t
                 else if (lua_isinteger(L, -1))
                     lua_print("%d", lua_tointeger(L, -1));
                 else if (lua_isnumber(L, -1))
-                    lua_print("%g", (double)lua_tonumber(L, -1));
+                    print_number_fixed3((double)lua_tonumber(L, -1));
                 else if (lua_isboolean(L, -1))
                     lua_print("%s", lua_toboolean(L, -1) ? "true" : "false");
                 else
@@ -458,10 +458,10 @@ static void pb_lua_dump_value(lua_State *L, int vidx, const pb_lua_field_t *f, i
         if (lua_isinteger(L, vidx))
             lua_print("%d", lua_tointeger(L, vidx));
         else
-            lua_print("%g", (double)lua_tonumber(L, vidx));
+            print_number_fixed3((double)lua_tonumber(L, vidx));
         break;
     case PB_LUA_T_DOUBLE:
-        lua_print("%g", (double)lua_tonumber(L, vidx));
+        print_number_fixed3((double)lua_tonumber(L, vidx));
         break;
     case PB_LUA_T_STRING:
         lua_print("\"%s\"", lua_tostring(L, vidx));