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This paper deals with the spatial structure and modeling the diameter distribution of three species with potential inclusion of commercial non-timber products. Data from Araucaria Forest were collected in a fragment located on the second plateau of Parana between the municipalities of Fernandes Pinheiro and Teixeira Soares, 5 km from Irati, PR. The research presents the dispersion pattern of the species and adjustment of diameter distributions Beta, Gama and Weibull-3P. The discussions revealed that the species have the same classification of aggregate dispersion, but great difference in the amplitude of results, so it was necessary drawing a layout of the species, in order to better comprehension of their spatial arrangements, it allows us to visualize the better way of access to these individuals. The fdp Weibull-3P is the distribution that fits better to the data of diameter distributions. The relationship between the spatial distribution of individuals and the curves estimated by the diameter distributions allow substantiating the strategic planning for the forest management area, where suppliers of non-timber products stand out as complementary option to the use of timber for commercial purposes. [ABSTRACT FROM AUTHOR]