Abstract: According to the researches on the population dynamics and effective accumulated temperature of Dendrolimus tabulaeformis, a Leslie matrix model of this pest insect is established. After the vector of population on some time are imputed, the development of the population can be showed. The simulation results basically fits what occurred in the field.

Key words: Dendrolimus tabulaeformis, Leslie matrix, Effective accumu-Lated temperature, Physiological time