Abstract: The characteristics of co-pyrolysis products of corncob-lignite with different ratios were studied under two heating modes, which called microwave and low temperature fixed bed.The results showed that when the corncob content was 30%, the tar yield under both heating modes reached the maximum, and the tar yield under the microwave heating was 16.31%, which was 39.40% higher than the low temperature heating (11.70%).The results of GC-MS showed that the content of aliphatic and phenol in microwave heating increased by 8.41% and 16.12%, while the content of heteroatom decreased by 34.51%, compared to low temperature heating, respectively, with the addition of 30% corncob, which achieved a high-quality tar generation.The SEM analysis of pyrolysis char showed that the surface of co-pyrolysis char under microwave heating became more rough, and there was an more abundant crack than the low temperature heating.