In construction of a wharf located in the Yangtze River in Wuhan, a vertical pile at the front row near water deviated 1.4 m, the part of which above the mud course had to be cut off for the follow-up construction,and another steel pipe pile with the same geometric dimensions was supplemented on the same site. The calculation was rather difficult and we solved the problem by CAD graphical method, which was proved feasible in practice.