Abstract: In order to master the pitch rational fatigue performance of Shanghai 65m antenna structure, the pitching shift working pattern of the fully steerable antenna was firstly modeled and simulated,and the calculating method of the long shifting fatigue stresses was put forward and observational frequency was used to represent its fatigue life.Afterwards,typical fatigue stress piece was decomposed by real-time rain-flow counting algorithms based on simple sampling.Finally,according to the Miner linear accumulative damage criterion,adopting many stochastic simulations of the typical fatigue stress piece,the life with a guaranteeing probability of 99.9% was analyzed statistically.The results show that during the design reference period,the pitch rotational fatigue life of the antenna structure can meet the safety requirement.