Long-term exposure to carcinogenic factors in the working environment, after a long incubation period and suffering from a specific tumor, is called occupational tumor. Occupational carcinogenic factors can include chemical, physical and biological ones, among which the most common are chemical ones. Skin and respiratory tract are the more common contact sites and direct organs of carcinogenic factors, so many occupational tumors occur in skin and respiratory tract, such as lung cancer caused by asbestos, arsenic, Ni, Cr+6, skin cancer caused by coal tar, asphalt, chloroprene, etc. However, there are also occupational tumors. However, there are also occupational tumors that occur at a site far from the site of exposure, such as occupational skin exposure to aromatic amines, leading to bladder cancer, which may be related to the excretion route. The legal occupational tumors in our country include occupational lung cancer caused by exposure to asbestos, coal tar-like substances, chloromethyl ether, arsenic, coal tar, chromate, radioactive substances, etc., skin cancer caused by inorganic arsenic, bladder cancer caused by benzidine, leukemia caused by benzene, angiosarcoma caused by vinyl chloride, mesothelioma caused by asbestos, etc.