EVA is used for bonding and fixing tempered glass and power generation main body (such as battery). The quality of transparent EVA directly affects the service life of the module. EVA exposed to the air is easy to age and yellow, which affects the light transmittance of the module, and then affects the power generation quality of the module. In addition to the quality of EVA itself, the lamination process of module manufacturers also has great influence. For example, the adhesion of EVA is not up to standard, and the adhesion strength between EVA and tempered glass and backplane is not enough, which will cause premature aging of EVA and affect the service life of the module.