Abstract: In order to save the water resource and avoid the pollution of the large amount of coalbed methane water, the quality of the water was analyzed based on 15 drainage samples taken from Liulin Mining Area. The combined process of "pretreatment+ reverse osmosis" was designed to treat the coal bed methane drainage. The results show that the properties parameters of the water such as TDS and Se are in breach of Standards for standard for Irrigation Water Quality in China for dry crops, and after the treatment, the quality of coal bed methane drainage treated by the combined process can meet the irrigation limit for dry crops. Thus the effluent can be used for irrigation, and the recycling of water resource was achieved.