Chemical composition of saturated solution of phosphate fertilisers commonly used in China have been evaluated.The data indicate that saturated solution of super phosphate (OSP) is a strong acid (pH=2.47) solution with high concentration of P(4650 ppm),accompanied.with certain Ca²⁺,Mg²⁺,K⁺,Fe²⁺,and Mn²⁺.The saturated solution of AP is a neutral solution (pH=7.44) with a concentration of P higher than OSP by 1-2 times (11,600 ppm-P).However,the solution of saturated serpentine phosphate (Ca-Mg-P) is an alkaline solution (pH=9.66) with very low concentration of P (less than 3 ppm).There is a strong effect of P-fertilizers on the pH of soil adjacent to the granule applird.OSP decreased the pH of all soils tested,Ca-Mg-P,however,increased the pH of all soils samples,on the other hand,AP increased the pH of neutral and acid soils but decreased the pH of the loess soils.ΔpH value (positive or negative) and the volume of soil affected by P-fertilizer depend on the soil texture,buffer capacity,and the initial pH difference between the saturated solution of P fertilizer and soil.In general,the heavier texture and the less initial pH difference resulting in the smaller ΔpH value and volume of soil affected,and vice versa.