A kind of hybrid of silicon-phosphorus was synthesized by the hydrolysis and polycondensation reaction of tetraethoxysilane,methyltriethoxysilane and phosphorus-containing silicon coupling agent which was synthesized by γ-glycidoxypropyl trimethoxysilane and phosphoric acid.A cured epoxy resin containing hybrid of silicon-phosphorus was prepared via the in situ curing of the bisphenol-A type epoxy resin and 4,4′-diaminodiphenylmethane with the hybrid of silicon-phosphorus.Thermogravimetric analysis,determinations of differential scanning calorimetry and limited oxygen index were carried out to characterize the cured products.It is found that the flame ratardance and thermal property of the cured epoxy resin is remarkablely improved.The limiting oxygen index(LOI) is 27.2,the residual char yield under 700 ℃ and Tg are higher than those of the pure epoxy resin 68.4% and 5 ℃,respectively,when 30% of the hybrid is doped into epoxy resin.This indicates that the cured epoxy resin possesses better flame retardancy and thermal stability.