Abstract: On the basis of coupled mathematical model constituting of hydraulic fracture and solution as well as solidfluidmass transfer, the corresponding numerical simulation are carried out in this paper. The results of numerical simulations indicate that the crack in rock salt is opened like the shape of sector during fracturing,and the relation among crack width , distance and time is nonlinear. The pressure distributed in the crack is transferred towards the tine of crack step by step, meanwhile it is gradually decreasing with the crack expanding. It is also found that both the simulated and the tested results well agree with each other.