Abstract: Abstract: Heat upgrading technology was the basis for the use of lignite to the depth, however, the severe fragmentation and pulverization of lignite, which occurred in the process, had been a key problem to prevent normal running of process. Based on the analysis of the causing reasons for lignite fragmentation and pulverization (water vapor behavior, volatile arising, mechanical force , heat processing parameters)in this paper , the influences in different drying / pyrolysis demonstration process were elucidated. According to the common problems of different processes, the key solving direction ,which included strengthen the basis law in research and innovative reactor design,was proposed.

Key words: Key words: lignite, heat upgrading, heat fragmentation, pulverization, dedust