Using a spectral analysis system,we measured the spectral reflectance of six tree species in both gaps and under-canopy condition of a broad-leaved Korean pine forest in Changbai Mountain. We compared the characteristics spectral reflectance and spectral indices in different environments,and that of different species in gaps.The data were adopted to study the influences of different environments in gaps and shading on plants′ physiological features,and to clarify the effect on plants′ competitive ability.The values of NDVI in gaps is higher than that under canopy,and the values of Chl NDI had the same tendency.In contrast, the values of PRI is lower in gaps.Despite the relatively sufficient solar radiation in gaps,the stress from other factors may not be released,which was implied by the fact that the photosynthetic rate was not significantly higher than in shaded area.