With the development of water transport，double-lane lock has been widely used in inland waterway.Different construction processes of ship locks have different impacts on the stress，and reasonable lock structure’s stress is the key to guarantee stable and safe lock system.This article uses finite element analysis software to establish the finite element calculation model of double-lane lock under asymmetric conditions relying on Hai’an lock，the characteristics of stress distribution and deformation of lock head and lock chamber under different construction sequence are analyzed.Results show that the differences of stress of lock head and lock chamber under different construction sequences exist on the space，and the difference is apparent close to the center line of the ship lock，and is weakened to both sides gradually.