Abstract: Comparing with a traditional mesh method, it has been found that the Smoothed Particle Hydrodynamics (SPH) method is an attractive alternative method to solve large deformations and free surface problems. In this paper, the applications of SPH theory was presented, and the penalty function was used to deal with the interaction of fluid and fixed wall to overcome the disadvantage of traditional SPH in imposing essential boundary conditions, The two dimension flowing state of a water filling process was simulated and showed a good agreement with experimental results. Compared with the results of traditional SPH, it had captured more flowing characteristics, and the fluid particles were more orderly due to XSPH algorithm.