The technological process of laser cutting of metallic and non-metallic materials is widely used in the machinery and equipment construction industry. Under these conditions, there is a permanent concern to improve the quality of the parts obtained, the quality of the surfaces resulting from cutting and their precision. The parameters of the cutting process: power, cutting speed, pressure, focus significantly influence the quality of the cut parts. The paper presents how a decision-making system based on fuzzy sets was designed and implemented for determining two technological parameters of the laser cutting process: air pressure and focus. The input sizes in the system were considered: the thickness of the material to be cut and the desired roughness of the cut surface. The output quantities were defined: air pressure and focus. The specific stages of developing a decision-making system based on fuzzy sets were completed. A user interface was also created. The results obtained by using the fuzzy system are compared with the experimental results.