Because of the large gradient and rapid current of the mountain rivers, the concave bank toe is easy to damage due to water scouring . By analyzing the specific reasons caused the collapse of the retaining wall, combined with the results, corresponding measures is proposed, and dike retaining wall is redesigned.It can provide reference for the mountain small and midsize rivers management project design.%山区性河流坡降大、水流急，其凹岸堤防堤脚容易因水流冲刷而产生破坏。通过分析造成挡墙坍塌的具体原因，结合计算结果提出了相应的处理措施，并对新建凹岸堤脚挡墙重新进行设计，可供山区中小河流治理工程借鉴和参考。
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