In view of the inconvenient handing of truss-type stop log gate in shiplock,we improve the design of a new lug structure for the gate to suit automatic grabbing beam based on the feature of truss structure. The lug is arranged on the upper plane truss,and connects to the nodes of the under plane truss by links,forming a space structure to make the force distribution more reasonable when the gate is hoisted. Then,3D modeling and mechanical analysis are carried out by INVENTOR,which verify the strength of the gate. Finally,the gate is used to an actual shiplock,which makes the handing of gate more convenient and saves much hoisting time.Thus it is quite economical and practical.