A facial ultrasonic method was used to synthesize CoO/Graphene nanohybirds by employing Co4(Co)12 as cobalt precusor.The nanohybrids were characterized by SEM, TEM and XPS, showing that CoO nanoparticles (3~5 nm) anchored on the surface of graphene with high dispersity.The CoO/graphene nanohybrids displayed high performance as an anode material for lithium-ion battery, such as high reversible lithium srorage capacity (7716 mAh g-1 after 50 cycles, twice of that of commercial graphite anode), high Coulombic efficiency (over 95%) and excellent cycling stability.The extraordinary performance arises from the structure merits of the nanohybrids: the nanosized CoO particles with high dispersity on conductive graphene substrates are beneficial for lithium-ion insertion/extraction, shortening diffusion length for lithium ions and good conductivity, thus improved the lithium storage performance.Moreover, the ultrasonic method can be chosen as a general route to prepare other metal oxides/graphite hybrid materials.