Occupational accident is an unplanned event that occurs in the workplace, resulting in death or that renders bodily integrity mentally or physically disabled. However, very few studies have investigated the effect of thermal change on occupational accident frequency. In this study, in addition to general factors, the effects of heat and humidity, which are thermal factors, on occupational accident frequency were investigated. According to the results of the analysis with fuzzy logic method, the variable of frequency of work accident after work accident; It has been concluded that the frequency of the accident increases with high humidity and temperature values, and the frequency of the accident decreases at ideal humidity and temperature values. Therefore, it is considered that taking thermal values into account in risk assessments will affect the reduction of occupational accident frequency. The textile sector has an important place in world trade and production as well as in our country. With the increase in production and competition, the dangers to the health and safety of the employees as a result of occupational accidents are increasing.