Abstract: To study constant temperature and rising temperature desorption laws of coal body containing gas after high pressure water injection, using self-developed adsorption-water injection-heating-desorption experimental system, and according to desorption characteristics of coal body containing gas under different conditions, the experimental coal specimens are from Gaohe Coal Mine and Gucheng Coal Mine in Qinshui Coal Basin. From the experiment, the desorption laws of CBM at different water injection pressure, adsorption pressure and temperature were obtained. The results show that the desorption capacity of Gaohe Coal Mine is higher than that in Gucheng at the same adsorption pressure in natural state without water injection；with the increase of water injection pressure, the ultimate desorption ratio of coal body containing gas at constant temperature is gradually decreased in nonlinear law. The decreasing law tends to steady once it is up to critical water injection pressure；heating process has an effectively promote on desorption capacity for coal body containing gas after water injection. with the increase of water injection pressure, desorption capacity after heating process is rapidly increased.