Grey model is the important content in grey system theory, many problems such as grey forecasting, grey policymaking and grey estimating are solved by setting up grey model.
灰色模型是灰色系统理论的重要内容，灰色预测、灰色决策、灰色评估等许多理论都是通过建立灰色模型来处理的。
Setting up GM(1,1) grey topological model groups and through analyzing conclusion, it indicates that such model is a kind of comparatively ideal method in predicting annual surface flow.
建立GM（1，1）灰色拓扑模型群，通过结论分析，表明该模型在年径流预报中为一种较为理想的方法。
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