The main components and relative contents of tars obtained in multi-stage hydropyrolysis(M-HyPy) of Xianfeng lignite were analyzed by GC-MS and compared with those in traditional single-stage hydropyrolysis (HyPy).The mechanism of formation of light-end products during M-HyPy was discussed.The results indicated that higher concentration and yields of BTX

PCX and naphthalene were found in M-HyPy as compared to HyPy

which is resulted from promoting hydrogenation and inhibiting repolymerization of free radicals due to the retention of hydrogen in M-HyPy.More light oil was obtained through regulating the reaction conditions

such as increasing pressure and gas flow.The tars produced in multi-stage pyrolysis under syngas were also analyzed.