The effects of pH,temperature and soil components on Zn adsorption in calcareous soils were studied.The soil samples were collected from the surface layer (0-15 cm) of yellow fluvo-aquic soil in Fongxian,Jiangsu.The experimental results showed that fitting of the adsorption data to the Langmuir equation,the Langmuir plots should be split into two linear portions.This may be considered that two Langmuir type surfaces existed.The adsorption maxirtia determined by a method based on the moving of the origin of coordinates approximately agreed with the experimental results.The effect of pH on Zn adsorption was very significant.At high pH range (7.5),the contribution of CaCO₃ to Zn adsorption was approximately 70% of the total amount adsorbed.At low pH the contribution bzcame less significant.The zdsorption capacity increased with increasing the temperature.