Abstract: The tars obtained from low-temperature carbonization of HDPE,PP,PPVC,and their mixtures with coal(with 5% plastics)were analyzed by GC-MS.The results show that the additions of HDPE and PP increase the yields of aliphatic hydrocarbons in tars.The remarkable increase of hydrocarbons and light compounds makes the tar be used as feedstocks for production of hydrogenated gasoline.The addition of PPVC enhances the yields of both aliphatic hydrocarbons and aromatic compounds.The physical and chemical synergism exists in the co-carbonization of plastics and coal and reduces the chance of secondary reaction,which increases tar yield and favours the formation of methyl-substituted aromatic compounds in tars.