Abstarct: Nowadays green chemistry processes are in progress, due to the increasing environmental concern and the substitution of traditional homogeneous catalysts by solid ones. Heteropolyacids are a class of polyoxomextalates with very wide applications. Since the reduction and acidic properties of polyoxomextalates could be controlled at atomic or molecular levels. Low surface area of heteropolyacids (1-5 m2/g) is the biggest limitation for their catalytic applications. Supporting the heteropolyacids on solid beds with high surface area could improve their catalytic properties in various catalytic systems. In present study nano-boehmite with high surface area (326 m2/g) and high degree of surface hydroxyl groups was used as catalytic bed and this bed was covalently functionalized with 3-(tri-methoxysilyl)propyl amine (AFNB). The AFNB was then supported with two of keggin heteropolyacids (HPA/AFNB) and they were characterized by FT-IR, UV-Vis and ICP techniques. The catalytic properties of HPA/AFNB were investigated in epoxidation of various olefins with TBHP and catalytic procedure was optimized for different parameters. Yields of products were investigated by GC. It was found that the optimized conditions with over 98% yield for epoxidation of 0.5 mmol cis-cyclooctene with PMo/AFNB and PW/AFNB were 20 mg of catalyst, 1.12 mmol t-butyl-hydro-peroxide as oxidant and 2 ml carbon tetrachloride as solvent at 77°C. The maximum yields were obtained after 60 and 180 min, with PMo/AFNB and PW/AFN respectively.