The Huangpu River is a long channel in tidal river.Compared with other similar channels,the Huangpu River also has the characteristics of concentrated port area,varied time of ship entrance and not berthing at the optimal time of tide.For the above problems,we research the relationship between import time and duration of tide by the method of multi-station water level combined calculation.Taking import time as the constraint condition,we calculate the corresponding time from voyage to each section(tidal time)according to the specific import time(tidal time).Combined with the mathematical relation between the time of rising and falling tide of a single station and the time of passing the station,we calculate the tide duration and the riding high tide level.Through the calculation of this method,under the condition of limited import time,the optimal tidal time and the corresponding riding high tide level required for vessels to dock at each port area can be obtained,and then the maintenance elevation of each section of the channel can be determined respectively.This method can make rational use of limited resources and reduce project investment.