Radiation-induced crosslinking of poly (methyl methacrylate) (PMMA)-poly (ethylene oxide) (PEO) blend were studied. It was found that PMMA in the PMMA-PEO blend can be crosslinked in the ranges of certain dose (1-20×104Gy) and composition (PMMA%=40-75) under the absence of oxygen. Moreover

it was also found that the crosslinking degree of PMMA in the blend in which content of PMMA is 70% is the largest. The crosslinking degree of PMMA in the blend is in close relationship with the polymer compatibility.The crosslink-ing degree of the blend prepared at 60℃ is much higher than that at 25℃ .