Abstarct: Supported mextal complexes as heterogeneous catalyst have been used extensively for a wide variety of applications. In these systems, the most important phenomenon is the catalyst elucidation from the support which will be overcome by use of covalent bonding of mextal complexes to the functionalized support. In this research Vanadium catalytic systems supported on nano-Fe3O4@Boehmite with high surface area and high degree of surface hydroxyl groups was prepared. Then it was covalently functionalized with 3-(tri-methoxysilyl)propyl chloride (CFNB). The terminal chloride group of CFNB then was replaced by imidazole (IFNB). This supported catalyst was used in epoxidation of cis-cyclooctene and yields of products were investigated by GC. The catalytic procedure was optimized for different parameters such as amount of catalyst, solvent, oxidant, temperature and time. It was found that the optimized conditions with over 95% yield for epoxidation of cis-cyclooctene with Fe@B-I-V was 0.02 of catalyst, 1ml CCl4 as solvent, and 1.12 mmol t-butyl-hydro-peroxide as oxidant at 85 ºC after 45 min In addition, recycling experiments revealed that these nano-catalysts could be repeatedly applied for nearly complete epoxidation of alkenes for at least four successive cycles.