The characteristics and restrictions of the parabolic mild-slope equation are described from the theoretical basis. According to the needs of the practical engineering, wave heights of the two improved programs on Dalian general-stone pier are simulated and researched using the REF / DIF model based on the parabolic mild slope equation. The simulation results show that both program 1 and program 2 can meet the harbor mooring conditions, and program 1 is better than program 2.