Abstract: This study choose low-rank Shenfu 3-1 bituminous coals as the testing sample,according to the different crushing liberation characteristics between vitrite group and fusain group,and primary enriched various components by crushing and screening tests,then assayed the yield and degree of dissociation of products with various density level by density gradient centrifugation.The experimental results show that the dissociating effect of vitrite group and fusain group of CM41 comminuting and classification system is better than the airflow comminuting and classification system.