Abstract: The first 100, 000 tonnage diaphragm wall sheet-pile wharf with the relief platform proposed to be constructed will be located at the Yancheng port, where there is a 5.3 m thick clay layer of high compressibility. As the clay layer is buried near the mud line of the port foundation, its unbeneficial effects on the stability of the wharf structures must be studied so that the safety of the designed wharf can be verified by geotechnical centrifuge model tests. The most unfavorable water level conditions of extreme low water level are simulated by the centrifuge model tests. At the same time the vertical loads on the wharf surface are simulated according to the procedure of wharf surface loading in the model tests. The response of bending moment at the diaphragm wall, anchoring wall, and cast-in-place piles is measured along with the response of the internal force of the tie-rods. The model test results show that the bending moment and anchoring force of the diaphragm wall and pile eventually become stable and that the lateral displacement of the diaphragm wall at the anchoring point and the inclination of the diaphragm wall are all in a reasonable interval, which proves that the proposed design scheme of the sheet pile structure is reasonable and reliable.