Based on the field measured data of year 2013 to 2015 implementation of the south passage waterway dredging engineering in the Yangtze estuary,we know that the 5.5 m navigation channel is through the south passage after the dredging engineering construction,and the navigation channel is stable for operation and easy to maintenance,which achieves the desired construction target and creates conditions for further channel development of the south passage.Meanwhile,main principles to be followed in the further navigation channel development and construction of the south passage is put forward.The research results can provide technical reference for the Yangtze estuary waterway system construction,Shanghai tideland reclamation and the Yangtze estuary comprehensive regulation.