Wenchuan earthquake (Ms=8.0, May 12, 2008, Sichuan, China) had caused great losses to both in life and property. The paper computes the accelerograms of Wenchuan strong earthquakes by Stochastic Finite-fault Method and obtained isolines of peak ground acceleration The study will provide reasonable interpretation of the cause and degree of structural destruction caused by strong ground motions during this event. It will improve the stochastic finite-fault method by incorporating structural aseismic capability.