(2) simulation. The simulation of BIM not only refers to the design of building model, but also refers to the simulation of things that can not be operated in the real world. For example, in the construction stage, when the personnel are not competent enough to draw the construction drawing or the communication and coordination work is not done well, the relevant personnel can carry out the actual construction simulation according to the construction organization design document, which is helpful to find out the problems in the existing construction scheme and some problems that may be difficult to solve in the future construction, so as to improve the existing construction scheme and make it better To guide the construction.