The investigation results on the displacement of some gravity wharves indicate that the displacement of the wharf which is over 0.2% of its height will be completed basically during the construction period, and the active earth pressure on wharf back can be occurred certainly in conformity with the design expectation. It also indicates that the displacement of the wharf which can be used normally will be less than 25 mm during service when the foundation is less compressible. A further statistical analysis reveals that the displacement of the wharf during the construction and service period is closely related to the condition of its foundation. The better foundation, the less displacement. But if the displacement is over 100 mm during the service period when the wharf is built on the compressible clayey soil foundation, it will affect normal operation of the quay and appropriate measures shall be taken.