Abstract: This paper takes the planetary gear transmission system in the wind turbine as the research object,considering the influence of the eccentricity error,assembly error of each gear on the uniform load performance of the planetary transmission system,a dynamic model of the planetary gear transmission is established,which considers the flexibility of the gear ring by using the discrete modeling method of the finite segment element.Furthermore,the influence of the error value,the number of support points and the tooth thickness on the load-sharing performance of the dynamic model is further revealed,and the sensitivity of the load-sharing coefficient of the system under each error is obtained by solving,and the influence degree of the system load-sharing performance is studied when each error exists in the parts of the model.The results show that:with the creation of errors,the fluctuation of the dynamic load of the system is more intense and the low frequency component becomes larger,compared with the flexibility of the gear ring is not included,the fluctuation amplitude of the dynamic load of the system and the low frequency components produced are smaller;and the average load coefficient of the planetary transmission system increases with the increase of the number of support points,when the number of support points is N times the number of planetary wheels（N is an integer）,the average load coefficient of the system is small.