Despite the booming of the hair salon bringing a wide variety of hair design technology and tools; however, the innovative hand tools bring some problems, such as radio-ulnar clubhand due to the overuse of hands and wrong exertion, envolving occupational injury and the danger of use. The issue of occupational injury occurs with the development of every industry. At first, researches use Observational Method to understand the operational behavior and job requirements; using QFD to assess the design of the curing iron in the market is the most corresponding to the job requirements. The design of the curing iron for hair salon faces too many requirements in the market, so it produces special shapes for the hair style or for the convenience of using handles; however, these changes can’t improve the problem of customers burned and the operation of hands. In addition, The bad hand tool design can affect the force of the hands’ muscles, using for a long time will cause the tire of muscles and wrists, easily causing disease of muscles and bones, forming occupational injury further. The results of this study can reduce occupational injuries generation hair stylist hand. The results of this study can reduce the incidence of occupational injuries hairstylist hand, and provide design assessment.