Abstract: Objective A reasonable rail cant can improve the wheel-rail matching relationship, effectively reduce wheelrail contact pressure and mitigate wheel-rail wear. However, current researches rarely address rail cant setting problems from the perspective of suppressing rail corrugation, and no studies have specifically examined the impact of asymmetric rail cant on inner and outer rails in a small-radius curve. Thus it is of value and significance to investigate and discuss the above research gap. Method Rail lateral and vertical displacement admittances are obtained through impact hammer origin point admittance test. A vehicle-track coupled multibody dynamics model is used to acquire wheel-rail contact parameters under different inner and outer rail cant settings. Through combination of both methods, the rail corrugation growth rate index for various rail cants is calculated. The influence law of rail cant on rail corrugation is analyzed from the perspective of preventing rail corrugation. Result ＆ Conclusion Using a multi-objective optimization method based on particle swarm algorithm, the optimal rail cant setting for small-radius curves is determined to be 1/40 for inner rail and 1/22 for outer rail. This setting effectively suppresses rail corrugation and significantly reduces environmental vibration and train interior noise issues.