In accordance with the trend towards cheap and trouble-free curing techniques

electron beam (EB) curing of composites involves using electron radiation to initiate the polymerization and crosslinking reaction in suitable matrix resins．EB curing technology of composites offers many advantages compared to conventional thermal curing and is an important innovative technology at present．Most variety of epoxy resins has been confirmed to possess radiation reactivity and has already become the chief resin matrix used in EB curable composites．The physical characteristics of epoxy resin systems cured by electron beam radiation were studied．The results of observing the cured areas indicate that EB-cured resins extend layer upon layer around active centers．Whole cured area consists of many lamellar structures. Through the analyses on the changes of curing degree with the radiation depth in the cured samples

it can be found that the gel fraction of cured epoxy resin increases with the rising of radiation dose. A maximum curing degree occurs at a certain depth of resin systems

but not at the top surface. A model interpretation was made for the process of electron beam curing．The dimension of cured areas is dependent on the pervasion power and concentration of high-energy electrons in the resin systems

and the influence of diffusion of reaction active centers is weak.