Abstract:In order to study the possibility and precision of the early growing forecast of Pinus sylvestris var. mongolica annual increment in height and diameter has been measured actually to 1500 stocks according to different site and types in plantation of P. Sylvestris var. mongolica with 14 and 25 ages. We also have computed coefficients of correlation of annual inorement of height with diameter age-grade. Results have shown that coefficients of correlation are greater when it grows both in early and later ages. Almost completely have arrived quite evident level in statistical test. Besides have done stem analysis to plus trees and their dominant trees of P. Sylvestris var. mongolica for confirmation result about the comput to coefficient of correlation.Conclusions show that early growing forecast of P. Sylvestris var. mongolica in the Jing Yue Tan is reliable and feasible. It was important that factor of forecast may select height of tree. Forecast was possible form 5 to 25 years.