Abstract: The refined coal products produced by Shenhua coal-to-oil preparation plant are supplied to coal-to-oil companies as raw materials for oil production.In order to provide better raw materials and high quality raw coal for oil production,the migration law of coal macerals in the process of washing and processing was explored,and then a new idea was provided for the optimization of the following production process.Taking the process sample of coal-to-oil preparation plant as the test coal sample,and by using process samples,industrial analysis,microscope analysis and infrared spectrum analysis,and combined with on-line measuring tools,the migration of different organic components in the production process was analyzed,and the theoretical approach to improve product quality in coal preparation plant was given.The results show that the H/C ratio of Shenhua raw coal is 0.84,which is a good raw material for coal-to-liquids.The content of raw coal ash is 9.45%,vitrinite content is 57.88%,inertinite content is 38.18%.The content of 0.50-0.25 mm vitrinite is 55.97%.The existing technology does not effectively separate the coarse coal slime,so it is necessary to strengthen the separation of coarse coal slime.It is difficult to enrich vitrinite by crushing and sieving because the contents of macerals in different sizes are not very different.In vitrinite group,88% enter into heavy medium cleaned coal,7% into coarse slime,5% into fine slime,and in inertinite group,59% enter into heavy medium cleaned coal,25% into gangue,7% into coarse slime,9% into fine slime.The high efficiency separation between inertinite and vitrinite by the existing separation process needs to be improved,which includes improving the selectivity and reducing the separation density.