Abstract: According to the research results on viruses, crucifer vegetable viruses were classified into four types in Tianjin region, (1) Turnip mosaic virus; (2) Tobacco mosaic virus; (3) Cucumber mosaic virus, and (4) Cabbage rigidity-stunt virus (not published).The study indicates that the main source of summer-cultivated crucifer vegetable viruses in Tianjin region is the seed-producing Chinese cabbage. Some other summer-cultivated and wild crucifer varieties are bridge hosts.Control methods of Chinese cabbage viruses are heraby suggested according to the reselts of the vanishgrowing law of viruses.

Key words: Crucifer vegetable virus, Tianjin