The Khorat Plateau potash deposit is a world- class giant deposit. The spatial distribution characteristics and the enrichment mechanisms of potassium salt are still unclear, which is a key scientific issue of the potassium salt mineralization system. Based on the 447 boreholes data in the deposit, the study systematically divided the salt and clastic layers of three sedimentary cycles and reconstructed the sediment thickness and burial depth of different rock layers. The main findings are as follows: the spatial distribution ranges of the three sedimentary cycles are different, showing a trend of increasing thickness from east to west. Potassium- magnesium salts are mainly concentrated in the western part of the plateau, with localized enrichment of potassium salts, and their thickness is significantly greater than that of the underlying rock salt. The coupling of basin morphology, intercrystalline brine migration, regional tectonic compression, gravity differential loading, and salt rock buoyancy maybe the main controlling factors leading to the local thickening of potassium salt anomalies. The local enrichment of potassium salt, rather than an absolute increase in the volume of potassium salt, is one of the significant features of the deposit. This study has important guiding significance for a deeper understanding of the mineralization mechanisms of the deposit, as well as for subsequent exploration and resource assessment.