This paper presents the formation of the magnetic insulation and the basic principles of its computer simulation. This paper uses the non-uniform grid model successfully to fulfill the requiremet of three-dimensional simulation modeling of the double post-hole convolute whose structures are complex. By using the metallic struts to realize the load modeling of the computer implementation, we explored the feasibility of applying the MPI parallel algorith in the simulation. Finally the simulation results are checked by using the double post-hole convolute of vacuum section of the Z accelerator as an example.