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As the vital component of the nuclear reactor coolant pump (RCP), the impeller plays an indispensable role in driving the coolant in the primary loop in the nuclear power plant. 1,2 The coolant circulation inherently brings flow fluctuation, especially pressure pulsation induced by the rotor-stator interaction, 3,4 and therefore, flow-induced vibration exists, which has a considerable impact on the impeller. Moreover, for the RCP in the actual operation, the impeller operates at a high-temperature, high-pressure, high-radiation, and nonstop environment. 5,6 Hence, it is urgently necessary to make a comprehensive understanding of the unsteady pressure pulsation and vibration characteristics of the RCP impeller.At present, research both into the unsteady pressure pulsation and the vibration characteristic of the RCP impeller