Abstract: Polyethyleneimine(PEI)/Quartz sand coated product was prepared using PEI as prepolymer,chloromethylthiirane as curing agent and gelatin as disperser.Two-phase curing process of coated body was studied and a two-phase curing kinetic equation(1-a=A/t + B) proposed.The reliability of the model was evaluated by the computer fitting.The curing process of PEI and chloromethylthiirane was studied,the surface structure after curing was characterized by X-ray photoelectron energy spectrum analysis,the surface group was characterized by infrared spectrum analysis and the physical structure of the coated body was revealed by biomicroscopy.The results show that nucleus easily dispersed in the medium,the rapid initial curing speed and short complete curing time are needed in order to obtain uniform and stable coated body.