Mine risk factors have been identified, and based on the theory of the accident causing to find the coal mine safety system consists of man, machine, environment, and management.
It is the key to solving environmental problems to adjust man-society relationship on the social system level with the relationship between man and natural environment in consideration.
在考虑人与自然环境关系的同时，从社会制度层面来调整人与社会的关系，是解决环境问题的关键。
3
Taking a civil airport as an example, the factors affecting the fly safety in this airport were analyzed according to the system engineering theory of "man-machine-environment-management".