In this paper,focusing the filling and emptying system design for multi-lane locks under increasing demand of traffic capacity,and taking the four-lane locks of Changzhou Junction on Xijiang River as an example,the dimension variation of these locks under the demand development of traffic capacity has been summarized,the design considerations of the filling and emptying system for each lock has been introduced according to its characteristics,that the 2nd lane lock has small dimension,the 1st lane lock has wider chamber,and the 3rd and 4th lane locks are paralleling twin locks with huge dimension,the innovative results such as baffle sill energy dissipation device used in the 2nd lane lock,double open ditches energy dissipation device used in the 1st lane lock and interconnected water saving layout used in 3rd and 4th locks have been put forward. Some advices have been given for references such as overall layout for future multi-lane lock should put the large lock at the riverside and put the small lock at the bank side,and the filling and emptying system design should consider the geological condition,structure pattern and hydraulic indexes,etc.