Abstarct: The composition air in an underground mine constantly changes by various factors including respiration of workers, blasting operations, penetration of hazardous gasses, and gasification of coal. According to the corresponding specifications, the grade of each involving factor must be in an allowable level. Nowadays, with development of technology and reduction of surface resources, the depth of underground coal mines are increasing. This increases the importance of ventilation problems in both aspects of design and implementation. This research evaluates the ventilation system of Malech Aram coal mine considering required air flow and the type of the fan for the current state of the mine. In the first step, 3D ventilation network of mine designed using Ventsim software and then the planning of mine network performed in order to validation of calculations. Finally, the performance of design evaluated with modeling the inflammation and polluted mass in the critical areas of the mine. Considering that the most of the air composition in the mine contains Methane, the ascensional-blowing ventilation is considered as the ventilation system. baxsed on the obtained results, the required air flow for ventilation of the mine in current condition is 5.94 m3/s and the suggested fan for producing this air flow is VOK-1 model.