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运用三因子联立评估法，评定了洞庭湖区洪灾、涝灾和洪涝灾的灾度，进行了相应的分析；构建了洪涝灾情指数，并运用联环替代法对各灾情因素的影响进行了分析．分析得出：洞庭湖区洪涝灾度具有阶段性和准周期性等特征；洪灾灾情因素是综合灾情变化的主导影响因素；各灾情因素影响方向不完全一致，其中起放大作用的因素反映出洪涝灾害的新特点；涝灾日趋严重，应加强涝灾治理。
The flood and flood disasters in Dongting Lake area were assessed using the three factor simultaneous evaluation method, and the corresponding analysis was made. The index of flood disaster was constructed and the influence of disasters factors was analyzed by using the method of double loop substitution. The analysis shows that the flood disasters in Dongting Lake area are characterized by periodicity and quasi-periodicity. Flood disaster factors are the main influential factors in the comprehensive disaster change. The impact directions of the disaster disasters are not exactly the same. Among them, New features; floods are becoming more serious, should be to improve flood control.