Considering the water and land area restriction of the steel-shell unloading wharf of the precast yard on Guishan Island for Shenzhen-Zhongshan Bridge，we research the general layout of the wharf for a semi-submerged barge in the restricted conditions. We adopt a separated arrangement scheme for the berthing area and turning area and enable the sharp turn of the barge before berthing by laying bollards on shore to help it turn around and move repeatedly. The barge track proves that the arrangement can meet the need of barge berthing. The design of general layout of the unloading wharf breaks through conventional design and reduces the occupied area of the water area for the wharf.