To solve the problem that there is no criterion for the detection and assessment of lock gate at present,we research the workflow,the items and methods of detection and assessment,and the rating of technology.By summarizing relevant engineering experience and referring to relevant specifications for sluice gate,we obtain a relatively complete system for dectecting and evaluating of ship lock gate,and the the practicability of the technique is verfied by an actual project.The research achievement can provide reference for related work.