Several synthesis routes of five kinds of halogenated pyridine compounds including 3,5,6-trichloropyridin- 2-ol, 2,3-dichloropyridine, 2-chloro-5-chlormethylpyridine, 5-chloro-2,3-difluoropyridine and 2,3-dichloro-5-trifluoro methyl pyridine were summarized in this paper. Especially, their applications in the pesticid...