Jiujialu Formation of Early Carboniferous and Dazhuyuan Formation of Late Carboniferous belong to karst bauxite ore- bearing rock series in central Guizhou and southern Chongqing. According to the characteristics of karst morphology combination, it can be divided into dissolution depression type and karst lake type. The lower part of the two types of ore- bearing rock series are mainly iron clay rock and chlorite clay rock, interbedded with hematite layer, and sometimes intercalated with dolomite and limestone lens. Both are permanent, low energy, shallow water and marine lake sedimentary products. The bauxite, bauxite and clay rocks in the upper part of the dissolved depression- type ore- bearing rock series occur in various forms of dissolved depressions on land. All kinds of bauxite, bauxite and clay rocks in the upper part of karst lake- type ore- bearing rock series are deposited in intermittent, flood control, high energy, shallow water and terrestrial lakes. Due to the close distance from the sea, under the influence of flooding and strong storm surge, the sedimentary characteristics of marine and transitional facies in the continental sediments of the upper part of the ore- bearing rock series. Under favorable geological, climatic, hydrological, plant and other conditions near the equator, the weathering crust material formed by the lateritization of parent rock is transported to the dissolution depressions and dissolution lakes in short distance by flowing water. The karst bauxite ore- bearing rock series formed by deposition is a continuous occurrence, development and evolution process in the same period, during which there is no obvious discontinuous period.