Abstarct: Grinding has an excellent place in the mineral processing industry because of its essential role in the extracting the precise minerals, reducing the associated cost of mineral processing and decreasing the chemical materials consumption. Considering the desirable grain sizes, process of grinding can be conducted within the both rod and ball mills. As the origin shape of rods and balls has been ruined after a specific time, efficiency of mills will decrees and considerable cost will be imposed to the mineral processing plants. As a matter of fact, various rocks with different component and diverse physical and mechanical properties are the most reasons of using unique rods and balls. The aim of this paper is to determine proper grinding media for the Esfordi phosphate mine. For this purpose, firstly, significant parameters and their associated effect on the grinding media are indicated and investigated. Ultimately, all of the appropriate factors and methods are collected for the selection of the reliable grinding media. In order to determine the proper grinding media, respect to the various produced rods and balls and evaluating the condition of Esfordi phosphate, four types of rods and balls has been selected. In the next stage, considering the associated parameters of grinding media including dimensions, stiffness, density, cost, input and output seed, mill velocity, work index, coherence index, percent of solid materials and etc, multi criteria and fuzzy multi criteria decision making are used for finding the best options. At last, steel balls and rods having chrome particles produced by Ductile Machine and ISC Tokyo are selected as the best ones respectively.