Abstract: Low temperature distillation equipment was used to study the low temperature co-pyrolysis of lignite and corncob under different proportions. The results showed that when the corncob content was 30%, the tar yield reached 11.70%, which was 53.75% higher than that of the lignite mono-pyrolysis. With the addition of corncob, the contents of CO, CH₄ and H₂ in pyrolysis gas gradually increased. The results of GC-MS showed that as adding 30% corncob, aliphatic content increased from 24% to 30.67%, the phenol content increased from 6.29% to 18.49%, heteroatom content decreased from 29.75% to 13.33%, which achieved a substantial pyrolysis of tar and high-quality tar generation. The SEM, BET and heat value analysis of pyrolysis char showed that the surface of co-pyrolysis char became more rough, and the pore structure was improved. The heat value of co-pyrolysis char was obviously higher than the lignite pyrolysis separately.