Based on the related data about the door at the access hole of gate chamber of the cross pulling gate for one long-span and deep-water navigation lock,this paper designs a new fish-bellied truss type of stop-log gate,and verifies its strength and rigidity through ANSYS,a finite element software.Furthermore,through the comparison between the design scheme of the new-type stop-log gate and the design scheme of the traditional solid-web stop-log gate,the results shows the economical efficiency and engineering practicability of the new-type stop-log gate.