Abstract: For the problem that the prediction value is far lower than the measured value of gas emission from adjacent seam by different source forecast method in No.8 coal seam of Guoyang No.2 Coal Mine. We found that the unconsidered gas emission from the gas containing K₃ and K₄ limestone under the No.8 coal seam under influence of mining is the main reason for the low predicted value in the No.8 coal seam by analyzing the causes of the errors. Through the statistics on the proportion of the coal seam gas emission and adjacent seam gas emission under closed coalmining face mining and in combination with the predicted method by different gas sources, we made a prediction about the gas emission of the adjacent seam. The predicted results show that the prediction of statistical prediction method is close to the measured, and the relative error is only -7.14% to 5.88% and it can be applied to the actual production in the mine.