Abstract: In order to clarify the effect of hydrogen-rich material on the yield and quality of tar from low rank coal pyrolysis and to elucidate the interaction mechanism during co-pyrolyis of low rank coal and hydrogen-rich material,Xilinhot lignite (XL) and rice husk (DK)were used as raw materials for low-temperature co-pyrolysis in an aluminium retort in this study. Hydrogen migration and distribution during co-pyrolysis of XL and DK were studied by comparing the experimental and theoretical values of yield of individual pyrolysis and copyrolysis products and the hydrogen content in pyrolysis products. Results show that there is a synergistic effect between XL and DK in copyrolysis process,the methoxy groups of lignin in DK combine with the free radicals released from XL,which increases the contents of phenolics containing with methoxy groups in co-pyrolysis tar. The co-pyrolysis of XL and DK has a positive synergistic effect on the formation of water and gaseous products. Compared with theoretical value,the hydrogen contents transferred to water and gaseous products increase 1.22%-3.33% and 1.16%-2.39%,respectively. While the hydrogen content transferred to tar decreases 1.00%-3.53%. AAEMs in DK not only intensify the secondary cracking of tar from DK,but also promote the secondary cracking of tar from XL,leading to the increase of C_2-C_4 hydrocarbon yield in gaseous products and the transfer of hydrogen from tar to gas.