Based on the finite element analysis method(FEM),this research focused on the trunk lid hinge reinforcement plate welding spots crack problem.The number of the resistance spot welding(structure adhesives)and the structure of the hinge reinforcement plate are analysed,and we found the method to solve the trunk lid hinge reinforcement plate welding spots crack problem.The stress of trunk lid inner panel was reduced from 128Mpa to 80Mpa,and the fatigue lifewas increased to more than 10000000 from 248000by CAE simulations,and the CAE simulationshas effectively verification with the prototype test.