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P2-type Na2/3Ni1/3-xMgxMn2/3O2 (x =0, 0.06, 0.08, 0.1) materials are synthesized by a solid state method and studied as cathode materials for sodium ion batteries for the first time.XRD, SEM and EDS results suggest that Ni was successfully substituted by Mg.Mg substitution suppresses charge ordering in the transition metal layers and Na+/vacancy ordering in the sodium layers, leading to smoother voltage curves below 4.0 V.Na0.66Ni0.23Mg0.1Mn0.67O2 exhibits excellent long-term cycling stability with capacity retention over 100％ after 100 cycles at the voltage range of 2.0-4.4 V, delivering a discharge capacity of 107 mAh·g-1 at 173 mA·g-1.