Abstract: In order to find out the quantitative method of protection and management of forest resources, the writers collected the investigative data of Picea and Abies population in Yeliguan Forestry Farm in 1983. Applying a method of mathematical statistics, the Logistic Equation of protection and management of forest resources in the area have been established, the computative method have been obtained. With these for forecasting, retaliating, determining quantitative maturity and cutting cycle were successful.