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本文以森林状态作为流域系统的主要特征，描述了森林水文作用的动态过程，推导出了流域系统水文动态平衡方程和水文作用方程，以及林冠持水过程、土壤渗透过程、地表径流形成过程、流域天然蓄水及释放过程和地下水输出等在时间和空间变化中的数学模型．为便于计算机数据处理，对上述连续过程模型进行了离散化处理．并进行了数字仿真，对不同时期的水文特征值和森林状态进行了比较和评价，得出了森林调节水文，涵养水源的定量结论．
In this paper, the forest status is taken as the main feature of watershed system, the dynamic process of forest hydrology is described, and the hydrological dynamic equilibrium equation and hydrological action equation are deduced, and the canopy water holding process, soil infiltration process, surface runoff formation process, Natural water storage and release process and groundwater output in time and space changes in the mathematical model. In order to facilitate the computer data processing, the continuous process model is discretized. The numerical simulations were carried out to compare and evaluate the hydrological eigenvalues and the state of forest in different periods, and the quantitative conclusions of the regulation of hydrology and conservation of water sources were obtained.