As with the increase in the number of times of opening and closing the door and the attachment of the door seal to the refrigerator for a long time, the door seal has been in a state of stress. After a long time, some aging and deformation will inevitably occur, causing partial depression and deformation, which leads to cold air overflow and then the refrigerator door cannot be closed tightly. It is recommended to remove the door seal and clean it, wipe it dry with a dry cloth, and flatten the door seal, and heat it evenly with a hair dryer to better restore its elasticity.