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In order to improve the stability and measurement accuracy of the magnetostrictive displacement sensor, and reduce the influence of the reflected wave signal on the effective signal of the output voltage, the generation and influence factors of the reflected wave voltage were studied. Based on the analysis of the influence of elastic pressure between damping and waveguide wire and the friction generated on the stress wave propagation, a voltage model of the reflected wave of the magnetostrictive displacement sensor under the action of damping was constructed, and the voltage amplitude of the reflected wave of the magnetostrictive displacement sensor was calculated. The results showed that the change of the damping parameter had a great influence on the amplitude of the reflected wave voltage, and the calculation result was basically consistent with the change trend of the experimental result. Based on the reflected wave voltage model, the optimal values of the damping length and Shore hardness were determined to be 5~10mm and 50~75, respectively, and the damping with a diameter of 10mm, a length of 10mm and a Shore hardness of 50 experimental verification were verified by experiments. Under the damping effect, the amplitude of the reflected wave voltage was reduced from 75mV to 4mV. At this time, the amplitude of the reflected wave voltage was much smaller than that of the effective signal, which greatly reduced the impact on the effective signal of the output voltage. The research result can provide a theoretical basis for the selection of damping parameters of the magnetostrictive displacement sensor.