Abstract: Based on InSAR measurements,considering the horizontal nonhomogeneity of crust of the south and north sides of fault,3D semi-analytical visco-elastic body force model and genetic algorithm(GA) are employed to invert the location of the co-seismic fault,slip distributions and the crust medium parameters(poisson ratio) with more realistic fault geometry.The model fits better than the half-space elastic model and can excellently explain the asymmetry with respect to the fault.The result shows that the earthquakes occurred in a region with obvious horizontal nonhomogeneity of crust.