The research of war situation simulation and situation display system is the necessary condition for designingintelligent military training system. An electromagnetic situation simulation method is presented based on pyramid model, bydividing the terrain layer by layer into quadtree, the pyramid model is divided into vertical layers and horizontal blocks to achieve theclose contact and continuous smooth transition between layers, so as to achieve the effect of fine simulation of 3D terrain scene. Forthe nodes in the adjacent two layers, the terrain grid distance between the parent nodes is larger than that between the child nodes,and the number of sample points involved is less than that of the child nodes, so the rendering efficiency is higher, and has higherapplication value.