: 1. unsafe human behavior. For example: paralysis, carelessness, work, in the "impossible consciousness" behavior, safety accidents; not correctly wear or use of protective equipment and other reasons;
2. For example: mechanical, electrical equipment with "sick" operation; _ mechanical, electrical and other equipment in the design of unscientific, the formation of safety hazards; protection, insurance, warning and other devices are lacking or defective.
3. Management defects. For example: some managers in the ideological awareness of the importance of safety work is insufficient, as dispensable, daily numbness and negative behavior, to treat the safety work, the safety of the legal responsibility of the awareness of the extremely thin.
4. Environmental reasons.