It is to stick a film-like object on the front and rear windshield, side window and skylight of the vehicle. According to relevant public information, this film-like object is also called solar film or thermal insulation film. Its main function is to block ultraviolet rays, block part of heat, prevent damage caused by glass splashing and prevent glare. At the same time, according to the unidirectional perspective performance of the solar film, the purpose of protecting personal privacy is achieved. In addition, it can also reduce the damage of ultraviolet radiation to the articles and people in the car, and reduce the temperature in the car and the use of air conditioning through physical reflection, thus reducing fuel consumption and saving some expenses.