In order to meet the trend of large and multiple-function vessels on Changshu chemical jetty, the rehabilitation and expansion schemes are researched according to the principles of not affecting the normal operation of Huihai petrochemical jetty at downstream side, not changing the apron line and handling technology, the ship load from the new large vessels being born by the new structure, and being completely independent from the old structure. Based on the analysis and comparison of several schemes, we put forward a better solution which is proved feasible by practices.