Fujiangsha reach is the only river section in the lower reaches of the Yangtze River where the river branches twice and hence has three navigable branches.For the time being,the right branch,i.e.the Funan passage is the main channel of the river.Moreover,on the right bank of Funan passage there lies the main stevedoring area of Zhangjiagang port district of Suzhou port,the largest inland port in China.Considering the construction proposal for the 12.5 m deepwater channel in the lower reaches of the Yangtze River downstream of Nanjing，and the deficiency in water depth at the upper mouth and the deficiency in channel width at the curved section of Funan passage,this paper demonstrates the waterway classification and waterway dimensions of the Funan passage which will be a dedicated approach channel to Zhangjiagang port district,and the layout of the operational water area of the inner port,in combination with the current status and planning of shoreline use and berth distribution of the port in Funan passage.Furthermore,the mathematical model was applied to research the back silting of modified layout and preliminary proposals on silt reduction were proposed.