The existing insulation system technology is relatively mature in China. The popular external wall insulation systems are: exterior insulation system, internal insulation system, and the interlayer insulation system. And the outer insulation system is used most frequently, but the drawback is that it lead to relatively complicated construction process, and it is not conducive to construction management. This article first analyzes the current external wall insulation system. Then in order to further improve the efficiency of construction, this article proposed two integrated pre-cast (PC) exterior wall. One is a combination with the self-insulation system and another is with external insulation. It not only will be energy-saving but will improve construction efficiency.