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In order to reduce the vibration caused by the unbalance of the helicopter rotor, an in-flight-tuning (IFT) system has been developed in recent years. It restores the dynamic balance state of the rotor system by dynamically adjusting the length of the pitch link. Smart pitch rod (SPR) is the actuator and important component of IFT system. SPR is characterized by high precision and large load. In this paper, a feasible design project is proposed for the SPR. It is first studied and trial-produced in China, and its servo performance has been verified by testing on the loading platform, the maximum thrust reached 25000N and the control accuracy is better than 0.01mm. A real-time rotor balance adjustment test has been carried out on a 10-ton helicopter rotor tower, the results show that the 1/ rev of the vibration of rotor could reduce by more than 80% .