Abstract: In order to achieve the stability of wind power speederer gear operation, through simulation analysis, a gear shape modification scheme combining tooth direction and tooth profile was proposed, and then the second genetic algorithm was used to optimize the optimal combination of gear parameters. When the second genetic algorithm is used, the transfer errors of the first, second and third planetary gears are reduced by 75.21%, 54.17% and 64.09% compared with that before modification. Compared with the formula modification, the decreases were 45.75%, 32.92% and 42.86%. In addition, the maximum vibration acceleration of the third stage pinion bearing is reduced by 24.96% and 3.19% compared with the formula modified and unmodified, which verifies the feasibility of the optimization scheme.