Taking masson pine forest stand in Boshan Forest Farm in Henan as research object ,the article de‐signs four stand reserve densities and every reserved density having three plots .The article studies the influ‐ences of different intermediate cutting reserved densities on the masson pine ,including the mean DBH ,stand average height ,the average individual volume and the stand volume .In addition ,the article adopts variance a‐nalysis to compare the significance .T he results and the variance analysis indicate that the intermediate cut‐ting can promote the stand growth .Variance analysis shows that the DBH and the average volume of individ‐ual tree increase obviously as the reserved density decreases ,but the intermediate cutting has no obvious effect on the average stand height and stand volume .At last ,the article points out that the reasonable re‐served density in middle age stands of masson pine forest is 1750 stands · hm2 .%以河南省薄山林场马尾松林分为研究对象，设计了4种不同的林分保留密度，每种密度林分设计3块样地。研究分析了不同间伐保留密度对马尾松林分平均胸径、林分平均高度、平均单株材积及林分蓄积量的影响，并用方差分析做显著性比较。研究结果及方差分析表明：间伐能促进林分生长，随着间伐保留密度的减小，林分胸径、单株材积增大显著；间伐能促进林分平均高、林分蓄积量增加，但影响并不显著；马尾松中龄林适合的保留密度为1750株／hm2。
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