The results of modeling of phytomass of the crown components of pine trees, which forms artificial forest stands within the territory of the Northern Steppe of Ukraine, are presented. The results of correlation analysis and basic statistics of the distribution of phytomass of the crown components of model trees are presented. A close direct correlation between the mass of tree greenery, branches and needles with the value of the diameter at breast height of trees was revealed. The mathematical models, which adequately describe the phytomass of the studied components depending on the biometric indexes of the pine trees, are developed. The obtained regression models of the dependence of the crown components on biometric parameters show higher determination coefficients for the equations of phytomass of tree greenery and needles, whereas they are less significant for phytomass branches. The results of the development of normative and reference support for estimating of phytomass of the crown components of pine trees in an absolutely dry matter are presented. The phytomass value of the tree greenery, branches and needles increases with an increase in the diameter at breast height. In the same time with the increase of the stem height, the decline for all the studied crown components is revealed.