The objective of this study is to investigate where the infestation of Cephalcia kunyushanica most likely occurs at different stand characteristics and geographic locations of Pinus densiflora forest communities in Kunyushan region. Using measurements from 40 permanent sample plots within P. densiflora forests in Kunyushan Forest Farm, we analyzed the variation of the larval density of Cephalcia kunyushanica with the stand characteristics of forest communities and the diversity of shrubs and grasses as quantified Shannon diversity index (H) and evenness index (JS) in those forests from 1996 to 2008. We found that 60% of trees have the diameter at breast height (DBH) between 5 cm and 25 cm in 2008, about 51% higher than that in 1996, and 67% of the trees have tree height between 2m and 10 m in 2008, about 57% higher than that in 1996. However the mean tree number density decreased from 13000 trees/hm2 in 1996 to 2377 trees/hm2 in 2008. Both H and JS of the shrubs and grasses within the forests decreased from 2.69 and 0.85 in 1996 to 2.5 and 0.79, respectively; suggesting a decline in diversity in those forest communities. It was found that the larval density of C. kunyushanica is significantly correlated with the canopy cover (R＝0.931, P<0.005), elevation of the forests (R=0924、P<0.005), tree number density (R=0.780，P<0.05), DBH of the trees (R=0.816, P=0.025). The spatial pattern of C. kunyushanica larval distribution seems to be consistent with the “resource concentration” hypothesis.