Abstract: Most of the packing materials used for liquid chtomototyraphy takes silica,gel as base The surface cf silica gel is modified by grafting of various functional bond phase to meet the purpose of separation and analysis.In some literatures,only the grafting method and the elemental analysis of bonded phase were reported.No detail quantitative determination has yet been published.This article describes the quantitative determination of material grafted on silica gel prepared by coupling reaction of silica gel with different concentrations of v-glycidoxyproplsiyl(P-GOPS) in water by differential thermal analysis(DTA) thermogravimetry(TG),element analysis(EA) and solution adsorption method.The results obtained are in agreement with those obtained by X-ray photon scat tering(XPS) method