Abstract: Hydroxyl modified SBA 15 (SBA 15 OH) was achieved by the reaction with glycidol. Using Sn(Oct)2 as catalyst, the ring opening polymerization of ε caprolactone and γ (carbamic acid benzyl ester) ε caprolactone was initiated by SBA 15 OH, and the hybrids poly(caprolactone)/SBA 15 (PCL/SBA 15) and poly(γ (arbamic acid benzyl ester) ε caprolactone)/SBA 15 (PCABCL/SBA 15) were obtained. After removal of the protective groups (Cbz) by acid, poly(γ amino ε caprolactone)/SBA 15 (PACL/SBA 15) was obtained. The structural change and the content of the grafted polymer were analyzed by XRD, nitrogen adsorption desorption and TGA. The results showed that the polymer modification did not affect the mesoporous structure of hybrids and the grafted amount of PCL could be controlled by reaction time. For PACL/SBA 15, the steric effect of the Cbz groups in CABCL led to the low grafting content in polymerization. Moreover, the Zeta potential results demonstrated that the surface charge property of silica was regulated by the modification of PACL.