The mixture of low metamorphic coal in north of Shaanxi and plastic was heated under microwave condition.Gas chromatograph-mass spectrometer (GC/MS) was applied to analyze the component of tar.The results showed that with increasing addition of a proportion of plastic,coke yield decreased gradually,while yield of tar and gas increased gradually.With addition of the proportion of plastic,the content of C5-C10 atoms increased from 12.264％ to 70.927％,while content of C11-C18 atoms decreased from 43.012％ to 20.80％.The total content of aromatic compounds in tar decreased from 44.024％ without plastic to 13.085％ and the total content of alkanes and olefins in hydrocarbons increased from 32.301％ to 52.105％.The content of benzene substances increased obviously from 7.385％ without plastic to 16.395％.Accordingly,total content of alkanes and olefins increased while pyrolysis with plastic,and the light of tar could be produced.
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