The reservoir immersion is an important part in the investigation and evaluation of plain reservoirs.The scientific prediction of the immersion area is crucial to the immigration,the maintenance of surrounding area and reservoir operation.Tak-ing Chushandian Reservoir in Henan Province as a research object,the capillary elevation of different types of low liquid -limit clay are obtained by using direct observation method and artificial test pit.Based on detail hydrogeological exploration,the hydro-geologic model of island roundabout land mass is established by GMS and the model parameters are identified and tested.The research result shows that the ground surface gradient is the determining factor to the boundary distribution of submerged area. According to the results of numerical simulation,the statistical formulas of the immersion range and the ground surface gradient of different areas,such as farmland and buildings,in roundabout mass are obtained.%水库浸没问题是平原型水库工程勘察与评价的重要内容，科学预测水库浸没区的范围对水库周边移民搬迁、库边围护及对水库建成后的正常运营都至关重要。以河南省出山店水库为例，利用直接观测和人工试坑法确定了不同类型低液限黏土的毛细上升高度。基于详细水文地质勘测，利用 GMS 对环岛形代表地块进行了水文地质建模，对模型参数进行了识别与检验。分析确定地表坡降是影响浸没区边界分布的主要因素，并根据数值模拟计算结果，分别给出了环岛形地块区域农田区和建筑物区浸没范围和坡降的统计公式，为平原型水库环岛形地块浸没范围的确定提供了依据。
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