The design and fabrication of a directional coupler electro-optic switches are presented.A strip-loading optical waveguide is proposed which uses organic/inorganic hybrid EO material,synthesized by sol/gel technique,as the active layer.Polymethyl-methacylate-glyciclyl-methacrylate(PMMA/GMA) with index regulator bis-A-epoxy,acting as the guiding waveguide,forms the coupler configuration.The device is fabricated by Corona poling,UV lithography and reactive ion etching method (RIE) process.A co-planar waveguide(CPW) electrode is adopted and the switches is working in electric push-pull way.The test results show that the device loss is about 16 dB,and a switching voltage of 9 V is observed.