Abstract: Structural characteristics of 49yearold larch plantation in eastern Liaoning was researched to discuss its naturalization process and then provided guidance for the management. The results showed that larch plantation in eastern Liaoning had obvious naturalized phenomenon, which was composed of 3-14 species, including Larix olgensis,Fraxinus mandshurica,Fraxinus rhynchophylla and other species. In the bottom of slope, the dominant species were Larix olgensis and Fraxinus mandshurica,in the middle of slope,Larix olgensis,Fraxinus mandshurica,Fraxinus rhynchophylla were dominant species,and in the top of slope,Larix olgensis and Fraxinus rhynchophylla were dominant species.In larch plantation community, the number of small diameter classes (2-6cm) tree and big diameter classes(18-36cm/34/30)tress were change of gradient of slope position. From the bottom to top, the number of diameter class of 2-6cm tree was gradually decreased, while they were increased for the number of diameter class 18-36cm/34/30 tree.In the middle and bottom of slope,Larix olgensis with largediameter(DBH≥26cm)was dominant, accounting for 586% and 600%, respectively. In the top of slope, middlediameter (24cm≥DBH≥12cm) trees were dominant, accounting for 667%. The diameter class of species renewal under forest mainly was composed of small size tree (DBH < 6cm), like, in the bottom, middle and top of slope, the number of middle size tree (DBH 2cm-6cm) accounted for 963%, 938% and 856%, respectively. Therefore, using near natural forest management pattern and constructing stable structure forest with unevenaged and mixed multistoried plantation to achieve the optimization of ecological and economic benefits in the future process of forest management is strongly needed. It was early stage of regenerative community formation.