A composite of graphene nanosheets (GNs) supported by MnO nanocrystals has been fabricated through a simple chemical-wet impregnation followed by the thermal reduction route. The hybrid contains MnO nanoparticles with an average size of 20nm uniformly dispersed on GNs as observed by transmission electron microscopy and X-ray diffraction analysis. The MnO-attached GN anode delivers a reversible capacity of 635mAh/g at 0.2 C in the voltage range between 0.01 and 3.5V. The MnO doping in the GN network plays a positive role in improving the Coulombic efficiency (92.7%) at the 1st cycle and rate capability (capacity retention (5 C/0.2 C): >70%). The superior cell performance of the GN anodes is ascribed to its unique framework, which intimately combines the conductive GNs with well-dispersed MnO nanoparticles. This present work sheds some light on the feasibility of the MnO-attached GN anodes for high-performance Li-ion batteries.