Abstarct: Coal as a major source of energy in the world has been used for centuries. The presence of methane in underground coal mines is one of the major problems, because this subject creates many deaths every year in underground coal mines. Presence of this gas in mines is not only difficult and dangerous work in the mine, but also makes it more expensive; because miners for ventilation and release this gas to atmosphere are growing incur additional costs. The release of this gas in the air cause further pollution of the atmosphere and increase the greenhouse gases in the air. Due to the high volume of gas in some of the seams of coal, mine ventilation of these seams cannot create a secure environment for coal mining, so degassing before, during or after extraction mining is necessary. Accordingly, the degassing of methane can reduce the risks involved in these mines. So, in this research, according to a review of all the latest, known and credible studies about Coal Bed Methane (CBM), the degassing process and methods of degassing coal mines are discussed. In Continue the geological parameters affecting on the process of removing methane was discussed. Feasibility of CBM in eastern Kelariz, western Razmja, Bornaki, Bozorg, Razi and Takht of eastern Alborz coal mines by using Rock Engineering Systems (RES) was calculated. baxsed on the calculation determine, the Razi coal mine has the potential to degassing, and events occurring in the mine, is evidence for this claim. Then, by using Fuzzy Analytical Hierarchy Process (FAHP) method, the best method for pre-drainage in this mine was selected. baxsed on the calculation determine, the vertical boreholes is the most appropriate method in this mine. In the final chapter technical and economic studies on the mine has been paid.