Hard-shell mobile phone case will not hurt the mobile phone. However, when charging, the case should be removed to prevent heat dissipation. Mobile phone case is an ornament to protect or decorate the appearance of mobile phone, and the mobile phone case is also diversified with the increase of mobile phone brand and function. According to the texture of mobile phone case, it can be divided into leather, silicone, cloth, hard plastic and soft plastic. The mobile phone case not only serves as an ornament to make the mobile phone a landscape, but also can prevent falling, water and shock. In the middle and late 1990s, mobile phone cases became popular with the opportunity of slimming mobile phones, and the types became diversified with the increase of mobile phone brands and functions. According to the texture, they are divided into leather, silicone, cloth, hard plastic, soft plastic and so on. By 20 13, the mobile phone case is no longer a simple practical commodity. With the popularity of mobile phones among young people, almost every young person who pursues fashion wants to have a unique mobile phone. Beautifying mobile phones has gradually become a way for them to show their individuality. In order to cater to this trend, manufacturers of mobile phone protective covers have introduced many products with better workmanship and more unique color patterns, which makes the types of mobile phone protective covers more diversified.