Transactions on Machine Design Qi Li-xia 4 1 2016 http://www.dline.info/tmd/fulltext/v4n1/tmdv4n1_1.pdf Human, machine, environment, management are the most important fur factors in the Accident-causing mechanism, and this idea has been accepted by all of us. But the relationship of the four factors, that is how the four factors mutual influence and lead to accidents, is not very clear. This will lead to difficulty in generating calculation model. This study considers these four factors in the accident formation process are not in a hierarchy. Human, machine and environment are accident triggered and in the basic layer, management belongs to the second level. Based on this idea, this paper establishes a logic calculation model for the accident-causing mechanism, and the status simulation method is used to calculate the model. The simulation results show that, the model for mechanism is explained more clearly on the accident. According to the model and simulation results, some measures controlling accidents are put forward at last.