Abstract: A serious coal and gas outburst accident in 2006 is studied based on the behavior safety model. The causes of the habits, the organizational behavior and the organizational culture are obtained further through analyzing unsafe acts of related persons and a conclusion is drawn that the wrong organizational behaviors (there are problems in the operation procedures) are the leading cause of the accident. Finally, the preventive measures are proposed according to the results including strengthening the safety culture construction, improving safety awareness of the staff at all levels and training the safe operation habits of employees.