Abstract: This paper focuses on change of the species diversity of Juglans mandshurica in different cutting way, which based on field investigations from different permanent sample plots in the Changbai Mountain forest area by using Simpson index (SI), Shanon-Wiener index(SH-WI)，Cody index（β_c）and important value (IV). The studies showed that change diversity in herb layer is more obvious than tree layer and shrub layer in the forest. all of Simpson index, Shanon-Wiener index and Cody index（β_c）were increased from remaining plot to selective cutting plot to clearing cutting plot. From the ordination of important value, there was obvious change after selective cutting or clearing cutting compared with remaining plot. We think that the diversity change seems to been caused by cutting interference, and reason is by light changing actually as well as by edge effect from time scale. Besides, by investigation on regeneration of J. mandshurica, both higher diversity of plants and well growth of seedling of J. mandshurica in clearing cutting plot are related to light factor, and it is no relationship between diversity of plants and well growth of J.mandshurica.

Key words: Juglans mandshurica, cutting interference, biodiversity, Changbai Mountain