Abstract: Based on the way of isothermal adsorption test, the test is on samples of coal reservoir in the main coal seam of Xinji No.1 Mine. Then the paper studies characteristics of methane adsorption and desorption in the main coal seam.The results show that the degree of gas enrichment in the main coal seam of Xinji No.1 Mine is high and very favorable for gas reservoir. From the perspective of mine field Langmuir pressure,the gas in the original condition of 13-1^# and 11-2^# coal seams is more difficult to drainage than in 8^# and 6-1^# coal seams.