During the new crown pneumonia epidemic, disposable masks are in short supply. In the case of shortage of mask resources, they can be reused by the following treatment methods: 1. UV disinfection: If you have a UV disinfection lamp at home, you can place the used disposable masks under the UV disinfection lamp and fully disinfect them before reuse. If there is no UV lamp at home, it can be fully dried in the sun, which can also play a disinfection role. 2.Dry heat disinfection: New coronavirus can be inactivated by heating at 56℃ for more than 30 minutes. If you have a dryer at home, you can consider baking disposable masks at 60℃-70℃ for more than 30 minutes for reuse.