Abstract: The paper carried out the adsorption / desorption experiments under different water contents,and the results show that the adsorption capacity decreases and the desorption rate increases with the increase of the water content un- der the balanced pressure and temperature. At the same temperature,the saturated adsorption capacity and the final desorption rate of coal show a good linear relationship with the water content,and the saturated adsorption capacity is almost not affected by water content. By fitting analysis,it is found that the Langmuir model can accurately describe the adsorption behavior of CBM,the improved Langmuir model is suitable to describe the desorption behavior and newly improved Langmuir model can be used to accurately fit the desorption rate data. With the increase of temperature,the parameter a in Langmuir model decreases. With the increase of water content and temperature,the parameter b decreases.