Abstarct: Longwall mining is one of two basic methods in coal underground mining. In Iran due to the poor economic situation and lack of an efficient method to determine the mining method and its feasibility, production level is not usually appropriate and non-mechanized methods are used in most coal mines. Maybe in coal mine is added equipment, production level increased. So using an appropriate method to parameter assessment in production level is achieved by mining method selection guide and this can help to improve the level of production in these mines. in this study, baxsed on coal mining methods and factors affecting, influence parameters on the level of production are discussed. Then using the factors identified to assessing these parameters and in order to analyze and identify factors affecting the level of production in coal mine, baxsed on probabilistic rock engineering systems (PESQ) methods are used. After assessing these parameters have been introduced production level index as probabilistic that it deals to assessing the potential level of production in mine. Finally to validation the proposed index, from information of MEHMANDOYE mine is used that the results of the index is good agreement with existing conditions.