A three-dimensional coupled dynamic model of heavy-duty train and track was built to study the influence of wheel flange lubrication on the curve negotiation performance of heavy-haul train.The model includes the heavy-haul train system,ballast-track system and wheel-rail rolling contact model considering multi-point contact and complex contact conditions.The model was used to compare and analyze the influence of wheel flange lubrication on the wheel-rail dynamic interaction during curve negotiation of heavy-haul train under idling and driving conditions.The results show that the wheel flange lubrication has a significant influence on the wheel-rail dynamic interactions when the locomotive passes curves.When the locomotive wheelset passes through a small radius curve,the longitudinal creep force of the wheel and rail at the position of the outer flange with wheel flange lubrication is obviously lower than that without wheel flange lubrication,and the steering ability of the wheelset is also weakened.Under the idling or traction condition of trains,the angle of the wheel with wheel flange lubrication increases obviously when passing through the curves.The wheel flange lubrication has little effect on the coupler and draft gear system of heavy-haul trains.