The lock capacity of ship lock is an important economic index,and its influencing factors are very complex.Based on the comprehensive evaluation method combining analytic hierarchy process and Delphi method,we systematically study the influence factors of lock capacity,and determine the weighted value of each index on the lock capacity.The results show that these factors including operating water level of ship lock,series and lines of ship lock,effective scale of ship lock,scale of ship and ship loading coefficient have a greater impact on the lock capacity.The achievements can provide the references for the similar projects.