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3，7-dichloro-8-chloro methyl quinoline is pure white crystal, mp129℃, soluble in organic solvents such as ethanol, benzene, chlorobenzene, dichlorobenzene, slightly soluble in petroleum ether, insoluble in water.

3,7-Dichloro-8-chloromethylquinoline is an intermediate of the herbicide quinclorac.

3，7-dichloro-8-chloro methyl quinoline's preparation method is to put 7-chloro-8-methylquinoline and o-dichlorobenzene in the reactor, and add catalyst azobisisobutyronitrile, heat up, pass chlorine gas, and control unreacted quinoline with gas chromatography, The content is less than or equal to 1%. Precipitation and recovery of o-dichlorobenzene give a mixture of 3,7-dichloro-8-chloromethylquinoline.