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In this study, the Beta regression types of sapwood, heartwood, and bark density of Larix olgensis were constructed. A complete of 35 woods were destructively sampled from plantations in three different websites, Linkou Forestry Bureau of Heilongjiang Province, Dongjingcheng Forestry Bureau, and Maoershan Experimental Forest Farm of Northeast Forestry University. AIC, R2, BIAS, RMSE and LRT were utilized since the goodness-of-fit statistics to compare and select the most optimal designs for sapwood, heartwood, and bark den