tSoil aggregate is the basic structure unit of soils and the ability of various size fractions are different inthe aspect of adsorbing and transferring heavy metals in the environment. In this study, bulk soil fromred paddy field was partitioned into four aggregate-size fractions and their adsorption characteristicsfor Cu and Zn were studied. Our results showed that: Pseudo-second order model was more successfulto fit the adsorption process in the kinetic experiments and the isothermal experiments data can bedescribed well with the Freundlich model as a whole. Due to higher contents in organic matter, CECand free iron oxide, the