Abstract: The adsorption behavior and mechanism of prochloraz and its formulation were studied in six kinds of paddy soil. The results showed that the adsorption balance times were from 5 to 10 h,and it was found that adsorption process of prochloraz and its formulation could be fitted to Freundlich isotherm process.Both of prochloraz and Sportak had poor mobility in the six kinds of paddy soil because they were adsorbed tightly by soil, and Van der Waals force played a fundamental role.the adsorption amounts of prochloraz and its formulation on soil were well correlated with organic matter contents,cation exchange capacity and clay contents of the soil.The result of the analyzing of the correlation between Kf and properties of soils showed that the adsorption amounts of prochloraz and its formulation on soil were well correlated with organic matter contents,cation exchange capacity and clay contents of the soil.Additionally, when prochloraz was formulated into Sportak,it’s adsorption amount will be decreased,the value of Kf will be lower one third .