Abstract: In the "Code for Master Design of Shiplocks",the scale and the layout of the approach channel are provided to guide the engineering design.However,the shiplock located in the mountain river can’t meet the requirements of design code because it is affected by conditions of geology and topography,especially boundary conditions.Therefore,based on the practical engineering of the approach channel and shiplock,comparison and discussion are conducted for the problems about the approach channel length,width,layout and anchor position.The suggestions are as follows: the approach channel length could be shortened and the entrance is in no need to be widened,the layout of the approach channel could be designed as semi-open straight line style or curved style,anchor area would be set at the expanding part of the approach channel.These suggestions could be provided for design code revision,which should be checked by prototype ships and fleets.