The wave uplift force is an important external load in high-pile wharf and piles.Based on the analysis of the formula system for the wave uplift force,we find the relationship between the uplift force and the water stage and bottom elevation,and the position of biggest uplift force appears,so as provide convenient and quick calculation.Comparing existing calculation formulae,we discuss whether the influence under the hydrostatic pressure shall be considered for the total wave uplift force.