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Aiming at the problem that the high-speed train system passes the turnout in the small hunting instability state. The lateral motion model of the high-speed bogie is established, and the turnout irregularity excitation model is established by using the domestic 18-channel high-speed turnout structure parameters, and the bogie is calculated under the small hunting instability state. The amount of traverse of the wheel turns at different speeds is compared and compared with the steady state. The analysis results show that the small hunting is related to the amplitude of the hunting movement when the turnout is in the state of instability. When the amplitude is small, it is basically the same as the aisle in the steady state, and the safe over-speed is the allowable speed of the turnout. When the amplitude is large, a small hunting divergence to the standard hunting instability will occur within the allowable passage speed of the turnout. The safe overshoot speed is lower than the allowable speed of the turnout. It is recommended to monitor the small hunting movement online before the aisle, and set the aisle speed reasonably through a small hunting state. Key words：high-speed bogie；small hunting；irregularity of turnout；hunting instability