Abstract: According to the characteristics of high oxygen content of Aiding lignite,the hydrogenation liquefaction of Aiding lignite were investigated in the autoclave.The effects of reaction temperature,amount of catalyst loading,H2 initial pressure and solvent content on the formation of phenols in direct liquefaction products of Aiding lignite were investigated.The results show that the optimum conditions for the direct liquefaction of Aiding lignite to produce phenolic compounds are listed as follow: reaction temperature 430 ℃,catalyst addition 1%,hydrogen initial pressure 5.0 MPa,solvent content 50%. The proportion of low-boiling phenol in total phenol is 0. 39% phenol,0. 51%o-cresol,1.08% m-cresol,0.97% p-cresol and 5.07% xylenol,respectively.The lower phenol( phenol + C1 phenol + C2 phenol) accounts for 10.7% of the total phenol by alkaline extraction of coal liquefaction oil,and the retention time of low-boiling phenol is 24-33 minutes,high phenol accounts for a large proportion,which is both abundant and complex with the extension of retention time.The increase of reaction temperature,catalyst content,and solvent content can promote the total phenol yield and the reaction of coal to produce phenolic compounds,while the hydrogen initial pressure has little effect on the total phenol yield.The increase of reaction temperature and catalyst content promotes the proportion of low-boiling phenol in total phenol,which makes the high-boiling phenol tend to produce low-boiling phenol,while the solvent content and initial pressure of hydrogen inhibit the proportion of low-boiling.In the process of direct coal liquefaction,high phenol yield can be achieved in the process of low temperature separation through hydrogenation reaction.And through circulation of high fraction,the reaction time of high fraction is prolonged and the oil yield can be increased,that is to say,it will be beneficial to control and increase the yield of oil and phenol by the graded hydroliquefaction.