Abstract: High entropy alloys have great development potential in industry with the advantages of high strength,high hardness and corrosion resistance. The phases of typical high entropy alloys include solid solution phases, such as face-centered cubic (FCC) phase,body-centered cubic (BCC) phase and hexagonal close-packed (HCP) phase, and amorphous phases. The unique phase structure has an important influence on mechanical behaviors of high entropy alloys. The mechanical behaviors of high entropy alloys with different phase structures are reviewed, and the research progress on phase structure prediction methods of typical high entropy alloys, including empirical rule, CALPHAD method, first-principles calculation and machine learning method, are summarized. The future development direction of phase structure prediction of high entropy alloys is given.