In order to balance and optimize the fatigue durability and its own torsional stiffness of the torsion spring in the sunroof wind deflector, this paper analyzed the influence of the structural factors of the torsion spring on the fatigue durability by orthogonal test. The results show that the inner diameter of the torsion spring has the greatest influence on the fatigue durability, followed by the number of spiral coils and wire diameter, and the free angle of the torsion spring has little influence on the durability. The relationship between the number of durability cycles and the torsional stiffness of sunroof wind deflector torsion spring shows that there is no obvious relationship between the torsional stiffness of the torsional spring and fatigue durability. According to the influence of structural factors of torsion spring on fatigue durability, this paper proposed a balance optimization and improvement scheme for fatigue durability and torsional stiffness of sunroof wind deflector torsion spring, by increasing inner diameter of torsion spring, increasing the number of spiral coils and wire diameter. Bench durability and downward pressure test results show that the improved scheme can meet the fatigue durability requirements while increasing tension of wind deflector screen.