The main goal of this study was to investigate space structure of pure pine stands, to assess optimal parameters of trees crown depending on stand age. The study was carried out in seven trials of 2 – 8 age classes pine stand. Trees crown horizontal projection area, the overlapping of crown, tree DBH, 5 years increment of diameter, tree developing class was measured of 200 trees in every trial. It was investigated that maximally possible crown projection area makes up from 12,0 thousand m2/ha to 6,5 thousand m2/ha while the age of stands changes from 2 to 8 age class. Depending upon the age of pine stand, maximally possible crown cover area makes up from 8,5 thousand m2/ha to 6,2 thousand m2/ha and decreases with increasing of stand age. The area of inevitable openings comprises 15-38 % of a forest area and increases with increasing of stand age. The overlapping comprises 43-6 % and decreases with increasing of stand age. The area of pine crown increases from 1,2 to 8,8 m2 while the age of stands changes from 2 to 8 age class. In the same age class the area of tree crown depends on tree developing class. The crown area of well-developed trees (class A) is 1.7-1.9 times bigger then crown area of poor-developed trees (class B) and 2.7-4.6 times bigger then crown area of trees being developed in a depressed state (class C). The crown area of vigorously-developed trees (class A’) is 1.8-3.5 times bigger than crown area of well-developed trees (class A). 1 m2 of the crown area... [to full text]