Among them, occupational injury accidents can be divided into 20 categories: object strike, vehicle injury, mechanical injury, electric shock, drowning, scald, fire, falling from a height, collapse, roof caving, water seepage, shooting, gunpowder explosion, gas explosion, boiler explosion, container explosion, other explosions, poisoning suffocation and other injuries. Occupational diseases are caused by pneumoconiosis, radioactive diseases, occupational poisoning and physical factors.