Abstract: With exploring the Yangguanzhai integrated exploration area and the analysis on the great borehole in formation, with the basic theory and method of the sedimentary、petrology and coalfield geology, the paper analyzed the sedimentary features、sedimentary sequences and sedimentary environment of the coal bearing strata in Weining county Yangguanzhai integrated exploration area., the paper had a study on the coal accumulation law,The results showed that the coal bearing strata of under segment Xuanwei formation in Yangguanzhai integrated exploration area is formed by meandering river flood basin sedimentary environment, the Characteristic of coal bed is lower continuity, small thickness, bifurcation, also ofen appeared pinch-out phenomenon; upper segment of Xuanwei formation is formed by meandering river and the bench sedimentary environment,the Characteristics of coal bed is good continuity, small thickness, good stability, simple structure of coal seam.