This paper uses the combining method as simulated test and theoretical analysis, simulated test for the gas desorption process about Cheng zhuang colliery of No.3 coal seam in Jin cheng in the case of different adsorption balance pressure and different desorption temperature conditions. Study on the gas desorption quantity and desorption speed affected on adsorption balance pressure and desorption temperature conditions, and got the influence size and corresponding relation on particles coal's gas desorptio...