In view of the problems encountered in the layout of gate area and brake section in the approach channel of lock by applying the general design code of lock，the connotation of brake section，entrance，entrance area and connection section of the approach channel of lock are expounded from the perspective of shipping safety.This paper introduces the existing standards of navigation safety at home and abroad and points out the existing problems，analyzes the water flow characteristics in the entrance area of the approach channel and the principle of ship rudder efficiency，and puts forward a feasible method of judging water flow conditions in the brake section for lock navigation safety，which has certain reference significance for the whole model test and the overall layout of the lock.