In order to improve the solve the defects of four-door and two-cover,by using analysis method of fish bone spur figure,the factors which may affect the selection and verification were analyzed.The results showed that in the four-door folding process,welding flange distance and distance folding adhesive glue size and package edge thickness were the main influence factors of sealant rubber foam.By controlling adjustments welding flange distance package edge distance folding adhesive glue size and package edge thickness,finally,the number of gas bubbles with four-door and two-cover was reduced from 6 to 0.5,and the improvement range of four-door and two-cover was 92%.