Cu2O particles with different shapes were prepared via reducing Cu(II) in alkaline system by glucose at 50 ℃.The products were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and transmission electron microscopy (TEM).It is found that the shape of Cu2O particles changes with the change of concentration of NaOH.The different shapes of Cu2O particles are due to the absorption of OH- ions on Cu2O particles,which arise the variety of growth mode of Cu2O,and then influence the morphology of Cu2O particles.