There is a broad market for upgrade and transform projects of old wharves all over the world with many requirements for design ideas，schemes，construction techniques and technical risk control. Combining with the design and construction of a gravity wharf upgrade with a cast-in-situ deck in East Africa，we summarize the design optimization of main structures such as the slope of dredging，types and layout of piles，deck styles，and the key points of reconstruction such as basin dredging with high SPT blow count，stability control of existing structures，construction procedures of the cast-in-situ deck. The results show that the design and construction scheme is feasible and reliable，which can provide references for the similar projects.