Shear wave velocity is the necessary condition for prestack inversion, so it can directly affect the result of prestack inversion. There are manymeans to get shear wave velocity, of which the applicable conditions deviated a lot. Based on the rock mineral composition of target zone, the elastic modulus, S-wave and P-wae velocity interval and several rock physical models were applied to obtain the S-wave and P-wae velocity. According to the comparison of model fitting results, we optimized the S-wave fitting model suitable for sand shale formation in Sulige Gas Field. The actual application result indicated that this method improved the accuracy of the simulation of shear wave velocity.