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壤中流作为径流基本成分之一已为许多国内外学者所证明，但由于其形成空间—包气带土层的物理性质及其构造的复杂性，以及土壤水运动方程解析法的多维局限性，很难用土壤水运动方程准确地加以描述，本文对包气带土层概化后用饱和下渗理论和非饱和下诊理论分析了等强度ｉ降雨的垂直入渗过程及壤中流的形成过程，继而总结出壤中流的形成机制及其产生的必要条件。
As one of the basic components of runoff, mid-stream flow has been proved by many scholars both at home and abroad. However, owing to the physical properties of its formation-aeolian soil layer and its structural complexity, as well as the multidimensional limitations of the analytic method of soil water movement equation, It is very difficult to accurately describe the equation of soil water movement. In this paper, the vertical infiltration process of equal intensity i rainfall and the formation process of soil mid-stream are analyzed with saturated infiltration theory and non-saturated theory under saturated soil infiltration theory , Then summarizes the formation mechanism of middle stream and its necessary conditions.