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We have systematically studied the behaviors of the resistivity and magnetization of CeSb2 single crystals as a function of temperature and extemal field.Four anomalies in the resistivity/magnetization-versus-temperature curves are observed at low magnetic field.They are located at 15.5 K,11.5 K,9.5 K,and 6.5 K,corresponding to the paramagnetic-magnetically ordered state (MO),MO-antiferromagnetic (AFM),AFM-AFM,and AFM-ferromagnetic (FM) transitions,respectively.The anomaly at 9.5 K is only visible with H||[010] by magnetic susceptibility measurements,indicating that the AFMAFM transition only happens along [010] direction in ab-plane.The four magnetic transitions are strongly suppressed by high exteal field.Finally,the field-temperature phase diagrams of CeSb2 with different orientations of the applied field in ab-plane are constructed and indicate the highly anisotropic nature of the magnetization of CeSb2.