Abstract: To investigate the distribution occurrence and dissociation law of organic anthracology maceral,taking a kind of representative floats from Qianjiaying coal mine as research object,the screen analysis and float- and- sink analysis were conducted on the coal samples which had different degree of crushing. The anthracology contents in coal samples were investigated. The results showed that,with the increase of products size,vitrinite content decreased,inertinite content rose,exinite content had no obvious change. The lowest vitrinite content and the highest inertinite content in + 25 mm products were 59. 81% and 35. 05%,while the highest vitrinite content and the lowest inertinite content in 3 mm to 0. 5 mm product were 72. 99% and 23. 30%. With the increase of dissociation degree,vitrinite content increased gradually.Compared with the vitrinite content in- 50 mm products,the vitrinite content in- 3 mm products increased from 72. 99% to 78. 01%. The recovery of vitrinite had little change. The vitrinite content in- 0. 5 mm products was 74. 95%,the products yield increased from 28. 36% to55. 19%,the recovery of vitrinite increased from 31. 42% to 62. 35%. The vitrinite content in- 1. 30 g / cm3 products raged from 86. 02% to95. 75%,the recovery of vitrinite in- 50 mm increased from 8. 05% to the range of 34. 68% to 38. 39%.