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Well-dispersed mesoporous spherical Cu2O assembled by small nanoparticles was synthesized by a green and rapid solution route at room temperature under assistance of ultrasonic,using eco-friendly ascorbic acid(AA)as the main reducing agent and glucose as a weak reducing agent and soft template.The Cu2O spheres were characterized by XRD,SEM,HRTEM,XPS and N2 adsorption-desorption isotherm.Its optical property was studied by UV-Vis diffuse reflectance absorption spectrum and the photocatalytic activities were evaluted by photodegradations of me-thylene blue(MB)under different light sources.The results show that each spherical Cu2O(ca.200 nm in diameter)was accumulated by numerous small nanoparticles of 8-10 nm and mesopores exist between the nanoparticles,which result in a high BET surface area.The spherical Cu2O exhibits good light-harvesting ability in both UV and visible light region and excellent photodegradation activities to high concentrations of MB solutions under both UV-visible light and visible light.