Abstract: Substation facilities are an important part of the power system, which is different from the conventional civil construction projects. There are a lot of electrical equipment inside, a large number of distribution and power cables interlaced. And the load is very complicated. At the same time, the substation is in the real-time operation state. It is not allowed to stop operation. Otherwise it cannot supply power to people's production and life normally, which will cause heavy losses and injuries to people's property and personal safety. In this paper, field information is collected by three-dimensional laser scanning technology, and the actual situation of facilities and equipment is reproduced by using mature modeling software such as 3ds Max, which directly reflects the specific changes and differences of facilities layout and equipment installation in the field of substation, so that managers can more directly through digital means obtain a series of 3D digital information such as the current layout planning, production and maintenance, parameter label, building construction etc.