In this study,bis-(triethoxysilylpropyl)phenyl phosphamide(BESPPA)was synthesized by the reaction between dichlorophenyl phosphine oxide and 3-aminopropyltriethoxysilane.Flame retardant,BESPPA and sol gel precursor containing hybrid materials were prepared by thiol-ene polymerization with the aim to improve the thermal and flame retardant properties.Thermogravimetric analysis showed that the addition of sol-gel precursor and BESPPA into the organic network improved the thermal-oxidative stability of the hybrid materials.The phosphorus-silicon synergistic effect on LOI enhancement and increasing flame retardancy of the UV-cured hybrid materials were proved.An LOI enhancement from 20.9 to 26.5 was observed for organic resins containing both phosphorus and silicon.Scanning electron microscopy(SEM)studies indicated that inorganic particles were dispersed homogenously in the organic matrix.