In today's global competitions, economic and production enterprises are focused on controlling the costs of raw materials, reliability of supply, reparability and support, as major factors influencing the total price directly and indirectly, in order to gain competitive advantage or advantages with the aim of gaining more market share. Therefore, suppliers play a key role in the efficiency and effectiveness of the organization in reducing costs, quality, profitability, flexibility, etc. With the increase of competition in the field of global trade, the method of supplying and selecting equipment in the supply chain is considered an important challenge for most organizations. Therefore, in the studied industry, according to the existing infrastructure of required equipment, having appropriate strategies for evaluating the quality level of suppliers based on supply risks in order to improve the competitive power and create a platform for the development of internal resources is necessary. In this research, the effective criteria on the evaluation of the suppliers' quality level were identified using the opinions and experiences of experts, the relationships between them were analyzed, and the criteria were ranked using the BWM method, and then suppliers (on a case-by-case basis) were evaluated using the GRAY TOPSIS approach. The results have shown that among the 16 strategic indicators introduced to the experts of the organization, four indicators of inward technology transfer, reliability, product reparability at the buyer's site, technical support and warranty in time were approved and in the evaluation method BWM weights of 0.61, 0.18, 0.14, and 0.05 were obtained, respectively, and finally, using the semi-ideal gray approach, 8 suppliers of the company were graded.
