Using resistivity，radioactivity and density logging curve，the authors analyzed the sedimentary environment of coal seams in some coalfields of Guizhou Province. According to numerical values and shapes of logging curves，the authors hold that coal seams of the exploration area consist of a set of alternate marine and continental sediments，and the coal seams were mainly formed in a peat bog environment of the delta plain. The construction of the sedimentary mode for the coal seam exploration area can guide the exploration of coal mines and help the study of coal accumulation characteristics and the forecast of coal thickness as well as the comparison of coal seams.