Based on the rainfall data of flash flood and geological disasters in Xiangxi Autonomous Prefecture from 1981 to 2010, the precipi-tation characteristics of flash flood and geological disasters were analyzed .The results showed that the distribution of flash floods and geological disasters in the central north was larger than that in the southe, mainly occurred during May-July.Rainfall intensity, rainfall duration and rain-fall quantity were closely related to the occurrence of flash folld and geological disasters .6 hours precipitation can be used as a reference index for the prediction of geological disasters.%利用1981—2010年湘西自治州历次山洪地质灾害的降雨资料，对山洪地质灾害发生时的降雨特征进行分析。结果表明，近30年湘西自治州山洪地质灾害的空间分布呈现中北部大于南部，5—7月出现山洪地质灾害的概率非常大。降雨强度、降雨持续时间和降雨量与山洪地质灾害的发生密切相关，小时雨强越大，累计雨量越大，发生山洪地质灾害的风险越高。6h降雨量对地质灾害发生概率的指示性更好，可以作为地质灾害预测的一个参考指标。
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