Li-rich layered xLi(2)MnO(3)-(1-x) LiMO2 (M=Ni,Co,Mn center dot center dot center dot) solid solution materials possess high energy density, high capacity, and long cycle life. Meanwhile, the electrochemical charge/discharge mechanism is quite different. In this paper, Li-rich cathode material xLi(2)MnO(3)-(1-x) LiMO2 M=Ni,Co,Mn center dot center dot center dot) is introduced though its structure, charge/discharge mechanism, synthetic methods and electrochemical performance. What is more, the characteristics and development trend of this series of cathode material are summarized.