Abstract: In order to accurately predict the amount of gas emission in coal mine, this paper introduces the modeling method of grey forecasting theory model and the evaluation method of model precision, the characteristics of using equal-dimension new-information model to analyze mine gas emission are elaborated. Taking the gas emission quantity statistics in Guqiao Coal Mine No.1116(1) working face of as an example, gray model is used to predict the trend of the gas emission quantity, the reasonable dimension of gray model is analyzed. Better results are obtained and the prediction model is practical.