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Co-pyrolysis of poplar wood sawdust and high-density polyethylene at a mass ratio of 1:1 over acid-modified ZSM-5 was studied by Py-GC/MS at catalyst to feedstock mass ratio of 1:1 to enhance hydrocarbon formation in the pyrolytic vapour. Catalysts were modified by wet impregnation using sulfuric acid (0.1 M, 0.3 M, 0.5 M and 0.7 M). Results showed that acid treatment affects the catalytic activity of ZSM-5 by changing the amount of acid sites. Co-pyrolysis with HDPE resulted in high relative content of olefin(53.32%) than pyrolysis of poplar (16.6%) and significantly reduces the amount of oxygenates except alcohol. In catalytic co-pyrolysis over acid-modified ZSM-5, the share of olefin was between 56.20% and 59.7%, whereas the lowest amount was 49.53% over P-ZSM-5. The relative content of alkane over acid-modified ZSM-5 was in the range of 23.29–25.96% and higher than that with P-ZSM-5 (21.18 …