Abstract: The mathematical model between ash content and coal macerals content was established based on the coal samples used for coal liquefaction in Shendong. The feasibility of the enrichment of coal macerals in compound force field was verified in this paper. The experimental research on the variable parameter separation of 1 -0. 25 mm coal sample was carried out by Falcon concentrator,and the separation mechanism based on the enhancement of centrifugal force field was revealed. The results show that the relationship between macerals content and ash content is obvious, and the model relationship can be expressed by an exponential function model. The separation test results show that the vitrinite content can be improved significantly in the compound force field,the vitrinite content in clean coal can reach 70% ,meanwhile,and the yield of clean coal is up to 80% . For 1-0. 25 mm samples,in order to provide sufficient ra-dial stratification power by fluidized water,the effective separation should be controlled in a lower centrifugal force condition. The compound force field can effectively strengthen the separation behavior difference between different coal macerals,which can effectively realize the enrichment of coal macerals.