There are totally 137 sample treesof 53 yearsMongolian oakin 0 .06 hm2 of Jiaohe City .The sample plothas high density ,large growth difference and general small DBH .The sample trees are mainly concentrated in four sec-tions ,namely the 7 to 9cm ,9 to 11cm ,11 to13cm ,and 13 to 15cm ,which occupy about 73% of the total number of sample trees .In the sample plot ,the average DBH of sample treesis 12 .5 cmand the overall distribution of DBH is left-skewed distributed .The regression equation of the DBH distributionis"y = -0 .7831x2 + 7 .9039x".%对蛟河市辖区0．06 hm2大小样地内53年大小蒙古栎纯林样木进行了统计，结果表明：样木共计137株，样地内林木密集、生长差异较大、胸径普遍较小，样木主要集中在7～9 cm、9～11 cm、11～13 cm、13～15 cm 4个区段范围内，4个区段样木之和约占总样木数的73％，样地内样木平均胸径D-＝12．5 cm ，林木胸径整体分布服从左偏正态分布。胸径分布回归方程为：y＝－0．7831 x2＋7．9039 x。
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