To meet the ever-increasing demand for high energy/power anodes in lithium ion batteries (LIBs),considerable attention has been focused on transition metal oxides (MO, M=Fe, Co, Ni, Mn, etc) [1-3].Mn3O4 has a high theoretical capacity of 937 mA.h/g and a relatively-low electromotive force (1.032 V vs.Li/Li+) resulting in a lower voltage polarization[4].These features make it suitable as the next generation anode material for LIBs.However, the poor conductivity and large volume expansion/contraction associated with Li+ insertion/extraction may lead to low reversible capacity and poor cycling stability.In this work, we prepared mesoporous Mn3O4 nanoparticles on graphene nanosheets by a two-step solution-phase method.The existence of mesopores and graphene can effectively inhibit the aggregation and volume change of Mn3O4 during cycling, and offers a large quantity of accessible sites for lithium-ion diffusion.This work might enlighten us on developing advanced MO energy storage materials with favorable structures.