Based on the basic propagation equation of stress wave,the propagation mode of stress wave in the rod was derived,and the stress wave downstream of the rod was predicted.A feedforward control system was designed to receive the stress wave propagation signal in the upstream of the rod.The received signal was used to excite the piezoelectric ceramic actuator in the downstream rod through the control system,and the actuator excited a normal force in the rod that was proportional to the input voltage.By offsetting the stress in the rod,the amplitude of the stress wave in the rod was reduced to achieve vibration reduction,and finite element simulation was conducted on the output results.The simulation results show that the measurement noise has a significant impact on the vibration reduction of the feedforward control system.The interference wave and noise signal propagated in the rod were modeled,and the state space expression was used to describe the modeling of the interference signal and noise signal.The output of the variance sum of the interference signal and noise signal was obtained,the parameters of the improved feedforward control system were determined,the modified feedforward control system was obtained,and the output of the modified feedforward control system and the stress wave cancellation process in the rod were simulated to verify that the modified feedforward control program effectively reduced the stress wave vibration in the rod.