The history and present status of studies involved in evaluation methods of soil silicon supplying capacity are reviewed and the merits and demerits of these methods are compared in this paper.The traditionally used 1 mol/L HAc-NaAc (pH 4.0) buffer solution method is inappropriate to evaluate silicon supplying capacity of soils with high pH values.The methods with water or dilute CaCl₂ solution can be used to evaluate the soil silicon supplying capacity.However,these methods are trivial and time-consuming.It deserves further study to explore a universal method to evaluate the silicon supplying capacity of soils within a wide pH value range.