Abstract: Influence of five kinds coupling agents on electrical and mechanical properties of glass fiber/epoxy laminated plate is discussed in this paper.The resuits are shown that after glass fiber being treated with coupling agent and activation energy of glass fiber for wetting being decreased, the reaction activity and wettability between glass fiber and matrix epoxy resin can be improved.A good interface adhesion of glass fiber/epoxy results in an improvement of electrical and mechanical properties of gjasp fiber/epoxy laminated plast.