Abstract: Coal mine gas accidents occur frequently in China, and the accidents have brought heavy economic loss and bad society impact. So reducing and controlling coal mine accidents have become the main tasks of current coal mine safety management. The risk measurement is the basic of risk pre-control of coal mine safety, and the human' unsafe behavior accounted for the largest proportion in the four kinds of hazards. The risk measurement model were constructed based on measuring the probability, importance degree and loss of the risk of the single-hazards. The probability was obtained by measuring the unreliability degree of the people's unsafe behavior, and Boolean algebra method is used to analyze the important degree of hazard in gas explosion accidents. Finally, according to the value-at-risk of the hazards, the priority level of controlling the single-hazards can be ascertained, and then different measures to the different hazards can be put into practice based on their priority levels.