In this paper, NiO with ordered mesoporous structure was synthesized by replicating template SBA-15 and its electrochemical capacitance characterization was for the first time studied in 2M KOH electrolyte solution. Electrochemical tests results indicated the ordered mesoporous structure can greatly increase the utilization of NiO, which is attribute to a large effective surface area due to the mesoporous structure. The capacitance of NiO with order mesoporous structure was about 120F/g, about four times larger than that of NiO prepared by direct calcining Ni(NO3)·6H2O at 550°C. On the other hand, the mesoporous NiO showed a good rate capability, which is due to that the ordered mesopores did not limit the ion motion within the pores.