International Journal of Business and Social Science Vol. 2 No. 14 www.ijbssnet.com 261 Evaluate, analyze and selection of suppliers based on supply chain approach, Fuzzy TOPSIS (The study of Iran-Tabriz Tractor Manufacturing Company) Alireza Shahraki Assistant Professor, University of Sistan and Baluchistan Department of Industrial Engineering E-mail: shahrakiar@hamoon.usb.ac.ir, Phone: 09155412783 Amir Bakhshivand Master student of Industrial Engineering, Islamic Azad University Zahedan branch, Iran Morteza Jamali Paghaleh (Corresponding Author) Department of Industrial Engineering, Young Researchers Club Islamic Azad University, Zahedan Branch, Iran, E-mail: morteza1362@gmail.com, phone: 00983913228846 Abstract In today's world, competition between companies in any industry has been so stressful and organizations that controls any moment become shorter life products and the emergence of similar products are capable of more performance. Therefore all large organizations to maintain their sustainable competitive market must accommodate and synchronize themselves with their customer’s needs. On the other hand, aligning and matching customer demands require organizations to constantly note how the process must focus on the products. Since the very high volume of activities related to these products, the company is done by external suppliers, attention and care on how they function is very important effects. Today, with considering the crucial and important factors of the customer’s perspective such as quality, price, service, flexibility and etc. we can get the customer satisfaction and to help this process are not things that could be a part of the supply chain and to improve product supply. Because improving each of these parameters is subject to the total collection to improve supply-chain products. This study presented a fuzzy decision making method for supplier selection problems in the supply chain. In this research, in order to evaluate and select the suppliers for all scales and its weight specification, language phrases used by experts and judges in IRAN_TABRIZ Tractor Manufacturing Company and engineering & supplying tractor Parts Company, have been used. Phrasal ratings have been expressed by triangle fuzzy numbers. Finally, using Fuzzy TOPSIS written in C++ language, the ranking of the suppliers for tractor manufacturing company in supply chain and the consequences of the mentioned above were discussed and investigated. Key Words: supply chain, supply chain management, supplier evaluation and selection, Fuzzy logic, FUZZY TOPSIS. 1. Introduction Various industries pay millions of dollars annually to improve their products and services. Products and services move in coming through the supply chain. Chains constantly change and face unexpected conditions. More investment in "product development" and "operations" are spending a lot of impact and affect the supply chain. The costs are including research and development of product, updating systems, investment in construction and equipment and even increasing human resources [25]. The aim of all activists who are in the field of supply chain has seen increasing competition ability. There are two broad tools to improve competition ability in a supply chain. The first one is integrating involved organizations and the next one is better harmonization of material, information and financial flow [19]. A supply chain includes all the directly or indirectly steps of involved customer's demand. A supply chain not only includes manufacturers and suppliers but also includes parts of transport, warehouses, retail and even their customers [7]. Mentzer and others defined Supply Chain Management such as; systematic harmonization and strategies of traditional parts of the business and also the tactics is used, whether from special corporate chain or within total chain, with the aim of improving performance of each company and the entire supply chain in long-term [21]. An important aspect of supply chain management is selection and management of supplier. In fact, success in providing outside suppliers start with the correct selection and in long-term is directly dependent on managing of the relations with suppliers because suppliers play an important role on a company's success or failure [8].