To accommodate 50 000～70 000 DWT bulk carriers, berths No.2～No.5 of Dagang port district in Zhenjiang port were strengthened. This paper introduces the way of partial innovation by using the existing structure system with additional new piles to build new mooring & berthing points in the design. Practice proves that this design makes full use of the existing wharf resources, saves investments and ensures smooth operation. It may serve as a reference for similar projects.