Growth and diurnal photosynthetic change of three years old Sanicula lamelligera under different light condition were studied.The results showed that leaf area index and Pn of plants under bamboo forest,the east of metasequoia glyptostroboides forest and the space were higher and growth better than under metasequoia glyptostroboides forest;the plants in the west of metasequoia glyptostroboides forest had miniest leaf area index,lower Pn and growth bad.