To solve the problems of excessive abrasion between the traction bracket pulley and the steel wire rope in the static loading test of wind power blade,a method of combining virtual prototype model and orthogonal test was used to study the influence of the structural parameters of the steel wire rope pulley on its surface wear,and further the optimization matching of its parameters was completed.The dynamic model of the winding process of the wire rope pulley was established by using virtual prototype technology,and the surface contact stress of the pulley was obtained by simulation.Combined with orthogonal experiments,the compressive stress on the surface of the pulley D1was selected as the test index,and all the simulation results were analyzed by using the methods of range and variance.It is shown that the diameter of the groove bottom of the pulley has the most significant influence on the abrasion degree of the pulley.Then the optimal combination of the structural parameters of the wire rope pulley was selected.This group of optimal parameters was numerically simulated.The simulation results show that when the pulley diameter is 330 mm,the diameter of the groove bottom of the pulley is 31 mm,and the deflection angle of wire rope is 3 °,the surface stress of the pulley is 6.09 MPa.At this time,the test index value reaches the minimum,which verifies the accuracy of the orthogonal experiment results.It provides guidance for the optimal design of the whole traction support.