If you want to reduce the damage of UV rays, it is best to reduce outdoor activities and go out as little as possible, especially when UV rays are stronger, such as after 10 am and before 5 pm try to avoid more outdoor activities. In addition, sun protection measures should also keep up, to be protected, the most common measure is to apply sunscreen, generally before going out must be coated with sunscreen once. In the hot summer, UV rays are stronger, the weather is hotter, if the outdoor time is longer, such as more than two hours must be reapplied sunscreen. In the case of going to the beach, highland areas and other UV rays are relatively strong, it is recommended to use some sunscreen with a high sun protection index, but also with an umbrella, wear a hat, wear sunscreen and other physical means of comprehensive sun protection, only then can reduce the damage of UV rays.