Abstract: Combing former research results,this paper set up theoretical model of predicting methane emerging time with CBM shaft drainage theory.By collecting CBM data from Yanchuan North Zone at the east of Erdos,various indices including methane emerging time,average water yield per day,accumulated water yield,desorption pressure,initial shaft-bottom flowing pressure and lifting index were made coupling analysis.Result showed that emerging time was positively related to average water yield,accumulated water yield and lifting index,and present quadratic polynomial rule with difference between initial shaft-bottom flowing pressure and desorption pressure.Thus,statistics model of methane emerging time was obtained.Prediction expression of methane emerging time was present by applying theoretical model and statistics model whose error was minor in application.