Abstract: Coal and gas outburst is a serious geological disaster, and it is influenced by many factors such as temperature, mine gas, ground stress, and coal strength. The particularity and complexity of the problem makes coal and gas outburst become human research problem. In order to prevent the occurrence of coal and gas outburst, the researchers at home and abroad have done a lot of explorations on the mechanism, and propose many hypotheses. We emphatically discuss the highest level of recognition of three hypotheses and their applicable limitations, and propose the existing problems. Meanwhile, it summarizes some more effective outburst prediction methods in current.