Ship large-scale may have advantages and disadvantages on increasing of passing capacity of lock node,so we study the dynamic and quantitative influence of ship large-scale on ship lock’s passing capacity.By the ship lock numerical displacement model based on the actual rules,we calculate the changes of key indexes of the ship lock’s passing capacity combined with the established large ship development trend sequence,such as the load mass,number of ships and the area utilization ratio of the lock chamber,etc.The results show that the ship large-scale has not all positive effects on the improvement of lockage capacity,and there is a trend of overall growth and partial decline.The combination of standardization and large scale is an effective strategy to improve the passing capacity.