Pb(Mg1/3Nb2/3)O3(PMN) relaxor ferroelectric crystals were prepared with PbO as additive by high temperature flux method. Phase structure and growth morphology were characterized by X ray diffraction analysis (XRD) and scanning electron morphology (SEM).It is indicated that most crystals showed color of light yellow and maximum size of 4 mm×4 mm×3 mm.The smaller ones had a pseudo cubic shape and the larger ones had not.The light yellow crystals were pure perovskite phase structure.Some growth defects such as dislocations and PbO packages were observed in the crystal surface, which was attributed to the composition and temperature fluctuation in the process of crystal growth.The slowest growth rate face {100} was the free exposing planes with thermodynamics stability.The growth mechanism of the crystals was a layer growth mechanism controlled by two dimensional nucleation.