Based on data available and borehole sections, this paper selected evaporate sedimentary cycles of Rhine graben in Europe, Kuqa Basin, Lanping-Simao Basin, Jianghan Basin and Dawenkou Basin to make analysis and comparison. In combination with the sedimentary background and some chemical analysis data of debris in drill holes, the authors analyzed the factors affecting potash formation, the potash-forming probability, and the horizon of potash deposits. Therefore, it is prospecting to conduct the potash investigation in Kaqa Basin.