In the modelling experiments on the accumulative amount of tile annual rings of Cunninghamia Lanceolate of different ages and heights growing on the southeast slope of the Tianzhu Peak, Gompertz function shows satisfactory response as well as small mean square error and high accuracy in simulation as compared with nonlinear least square Logistic function, and thus has considerable advantages over general linearized models.For this reason,it is safe to say that Gompertz function is good for the simulation of the accumulative amount of the annual rings of Cunninghamia Lanceolate growing on the southeast slope of the Tianzhu Peak in the Dabieshan Mountains.It has been proved that there is similar tendency in the influence of tree ages on the width of the annual ring.