Abstract: Coal and gas outburst is a dynamic phenomenon influenced by many factors. Using the theory of risk interface, risk factors are divided into two parts with the risk of outburst source and it of countermeasure against outburst. Each part is divided into three parts, and that risks always exist on the interface, which interface the failure will be dangerous energy into the accident. A fishbone diagram identifying risk factors in coal and gas outburst process was given according to this theory. The results show that the probability of turning into an accident is extremely high due to frequent interaction between the dangerous energy carriers of coal and gas outburst.