According to the style of stratigraphic superposition and cycle of sedimentation, the authors further subdivided them into six system tracts. On the basis of the basic deposition maps and the analysis of sedimentary environment, the authors have revealed that the sedimentary evolution characteristics of the Badaowan Formation in the Kamst coalfield were mainly affected by the difference in land forms and palaeoclimate. It is found that the coal-formation of the purpose layers occurred during the period of lowstand and highstand systems tracts, but lacustrine transgression was not conducive to coal accumulation.