Abstract: According to the observed data and relevant references, an in-depth analysis on the pro cess of canopy interception is given, and analogized with the curve of up-saturation function which based on the theory of solution adsorption in physicochemistry, a set of new models on the relationship between the rate of rain falling to the forestland, the rate of interception, the intercepted quantity and the rainfall outside the forest is presented. Three parameters μ_m、 P₀ and k in the models have definite hydrological significance. As we compare the results from the model with observed data, the consistency is quite sati sfactory. And all of these would have some significance for further canopy interception researches.The formula of the rate of rain falling to forestland.

Key words: Rainfall outside forest, Rate of rain falling to forestland, Intercepted quantity, Rate of canopy interception, Curve of up-saturation function