The refractive index distribution and geometry dimension of the optical waveguide have a great influence on the light waves which transmit in the optical waveguide. So it's difficult to design the optical waveguide devices. If the traditional experiment is used to design the optical waveguide devices, it needs more time and people to finish. Therefore, the simulation software of the optical waveguide devices is designed. This software can achieve CAD graphics interactive editing and output the graphics of the simulation results. The CAD software uses the simulation algorithm based on the finite difference beam propagation method (FD-BPM), which can provide the practical solution and software tool for the optical chip design.