Abstarct: Recognizing the factors affecting gas emissions from coal laxyers, in order to increase the safety of underground workshops, prevent the occurrence of methane gas explosion, self-immolation and fire, collapse of the extraction workshop, economic use of methane gas from coal, cost reduction Ventilation systems and mitigation of harmful environmental effects are necessary. In order to implement degassing systems in coal mines, this research is presented to first affect the factors that affect the gas emission of methane emitted from coal laxyers; Identify and in the next step, determine the relationship between each of the parameters by determining the impact and effectiveness of each of the factors affecting gas emissions. Finally, by determining the weight of the effect of each parameter on the gas emission of methane emitted from the coal laxyers, an indicator should be determined to assess the gas emissions of the coal laxyer. With studies; Fourteen parameters affecting the gasification process were identified. Fazzy DEMATEL method was used to determine the effect of the parameters. baxsed on this, the opinions of experts and experts active in the field of coal mining have been used. After collecting survey tables from experts, ten questionnaires were approved. The comments applied in the survey tables were converted into primary matrices using fuzzy numbers, which were finally determined by applying the Fazzy DEMATEL method to the weight of the impact of each of the parameters affecting the gasification process. Then, in order to calculate the gasification evaluation index baxsed on the weight of the parameters, a point was assigned to each of the parameters affecting the gasification, baxsed on the impact on the gasification process. This score is baxsed on the impact of each parameter on gas consumption. By determining the weight of each parameter and the score corresponding to its quantitative range, the gasification evaluation index is calculated. The gasification index obtained indicates the intensity of gasification under certain conditions of a particular project with technical specifications of the coal laxyer or a mine. The higher the value of this index, the closer it is to 100; This means that the methane gas emission rate in the project is so high that it needs to be degassed. For this purpose, by classifying this index, coal gasification is evaluated.