The existence of the ion acoustic soliton in heat plasma and its propagation mechanism are analysed.According to far field simple waves theory and perturbation method,a Kortweg-de Vries equation is deduced.%分析了热等离子体中离子声孤子存在及传播的力学机制，并根据远方场简单波理论，采用摄动方法推导出了KdV方程．
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