In this system, after the completion of the building skeleton, all the surrounding and separating walls of the building are built with this method, and the implementation steps are as follows.1- The metal structure and support is used on both sides of the wall.2- Electrical and mechanical installations and sewage and water pipes are placed inside the wall.3- The two wall finishes are performed as a dry facade and in stages.4- At the same time, the middle of the wall is filled with polyurethane or gas light concrete.Advantages:The weight of the whole building is reduced and lightened.The execution speed is increased.The cost of wages and materials is reducedInsulation is complete.