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The objective of this study is to evaluate the efficiency of the log-Pearson type III function to describe the diameter structure of even-aged stands, and propose a diameter distribution model using the function. The modeling function performed by the log-Pearson type III was compared with the modeling performed with the Weibull function. For this we used data from permanent plots of eucalyptus, located in the Midwestern region of Minas Gerais. Adherence to the functions of the data was confirmed by applying the Kolmogorov-Smirnov test (KS). The diameter distribution models used were based on models proposed by Nogueira et al. (2005) and were evaluated in terms of RMSE (%) and the correlation coefficient between estimated and observed values. All fitting to the data presented adherence by the KS test. All equations fitted for the recovery of the diameter distribution showed high correlation coefficients and can be used for modeling the diameter distribution of eucalyptus.