An experiment was conducted to study the community species composition , diameter class structure and the naturalization trend of larch plantation by using sample plot with net check survey method , community importance value analysis method and diameter class division method. Results show that: along the gradients of slope position from upper to lower, larch predominate in each community (importance value 0.376—0.461), Korean pine occupy the subdominance and present gradually increasing trend(importance value 0.279—0.402), hardwood trees also occupy certain proportion(importance value 0.186—0.290), and all the communities present obvious naturalization trend; proportions of larger diameter class larch reduce(29.79 %—11.32 %) while middle diameter class larch proportions increase(68.08 %—88.68 %), proportions of middle diameter class hardwood trees increase (18.18 %—58.34 %) and small diameter class trees reduce(81.82 %—41.66 %). There is no large diameter class trees exist, proportions of middle diameter class Korean pine increase(7.68 %—15.00 %) while smaller diameter class trees reduce (92.32 %—85.00 %) and no large diameter class trees exist. Therefore, more attention should be paid to cultivating Korean pine and hardwood trees under larch plantation.
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