The content of W, Mo, Co, Cr, Al, Ta and other elements in the single crystal superalloy was optimized through experimental data and thermodynamic calculations.A new third-generation single crystal superalloy WZ30 with Re content of 5 wt% was designed. In this paper, the metallographic and mechanical properties of WZ30 are studied and analyzed, and compared with existing second-generation and third-generation single crystal superalloys. The results show that WZ30 has uniform microstructure after heat treatment. The yield strengths of WZ30 are 938MPa, 639MPa and 436MPa at 760℃, 980℃ and 1100℃ respectively. When the temperature is higher than 1000℃, the tensile performance of WZ30 is better than that of the second-generation single crystal superalloy. The creep rupture life is 642h at 980°C/250MPa; the creep rupture life is 254h at 1100℃/137MPa, which is significantly better than that of the second-generation single crystal superalloys. The low cycle fatigue life of WZ30 is better than the second-generation single crystal superalloy DD6 at 980℃. WZ30 alloy has better oxidation resistance and structural stability in high temperature cyclic oxidation experiments.