This article creates a generalized linear reservoir model from linear reservoir model. It is based on the common characteristics of electrons and? water molecules, and uses mathematical and physical methods deriving the symmetry for the generalized linear model of the reservoir and the resistance capacitance (RC) network model, thus, revealing their parameter connotations. A large valley is gathered together by a number of small valleys, a small valley is formed by some of the smaller catchment units. Rainfall in the valley through the rain runoff mechanism collects to a basin export, and forms a watershed runoff. If each unit is regarded as a single linear reservoir, according to their geographic data, and without the history of observed data, the complex parameters of this model basin can be obtained. In the end of the text, we demonstrate the accuracy and feasibility of the generalized linear reservoir model of RC network simulation by an example.