Advances in soil potassiurn(K) research in the last decade was reviewed. Soil Potassium is usually divided into water soluble. K, exchangeable K, non-exchangeable K and mineral K. The exchangeable K can be further divided into surface adsorbed K and specifically adsorbed K. The contents of K in various forms and their transformation processes determine the K-supplying pawer of soils. Methods commonly used to derermine thermodynamic parameters of soil K exchange processes are the equilibrium method and kinetics approach, The thermodynamic parameters obtamed can be used to explain the mechanisms of soil K transformation. For kinetics study of soil K, batch equilibrium technique, miscible displacenment techmique, and ion exchange resin method have been used. The results can be descrihed by using the first order equation, Parabolic: diffusion equation and other functions.Potassium dynamics in rhizosphere has received great attention in recent years. The results have been used to evaluate the characteristics of soils in K supply.