Abstract: Pressure balancing ventilation method has already become a mature technology and widely used in working face under the mine fire, the good and bad effects of this technology have great influence on the working face during the period of mining and withdrawing. The predict method based on the gas monitoring is useful measures to reflect working face's safety situation. The paper takes Wuhushan Mine 1201 working face as an example, the main point of the research is the plan of gas monitoring during the withdraw period.