Abstract: In order to meet the user’s requirements about the ultraviolet (UV) protection, this paper investigates a product of mobile internet devices, which is location-based UV forecasting. This paper discusses four aspects of UV forecasting product including user research, function planning, algorithm formulation, and instruction library. This product meets many different kinds of sunscreen requirements. We develop the bark scorch algorithm and set up the precise prompting library. After the product was serviced on-line, the users have given many good feedbacks. At the same time, this product has been explored through the e-commerce mode of sunscreen products.