Through the observation of microscope and SEM, the failure types of resin and rubber were accurately analyzed (such as impact failure, ductile failure, fatigue failure, etc.), combined with chemical analysis and process related knowledge and experience, the accurate failure reasons (poor design, poor molding, poor post -processing, poor use environment, etc.) were obtained, Through the accurate analysis of the causes, we will solve the problem of resin and rubber.In the development and material selection stage, we will evaluate the ability of suppliers, grasp the ability of the whole product process from raw materials to molding and then shipment, criticize the possible problems and urge improvement to meet our requirements.