With potted seedlings of Cunninghamia lanceolata as the subject, this research measured and analyzed changes in the concentration and distribution of nonstructural carbohydrates (NSC) and the NSC pool in different tissues/ organs after shading and light restoration. The former treatment being achieved with 60% shadenet, normal lighting being the control; after 30 days of shading, some materials were put under light restoration for 20 days. In this way, this paper studied the NSC regulation mechanism of C. lanceolata seedlings after shading and light restoration. The results indicated that: (1) shading could significantly reduce the concentration of soluble sugar in tissues/organs of the seedlings, the amplitude of reduction in turn being: fine roots (71%) > currentyear needles (68%) > oneyearold needles (58%) > bark (57%) > xylem (55%) > coarse roots (45%); shadingcaused decrease of starch concentration was significantly sharper than that of soluble sugar; of all tissues/ organs, the margin of decrease in starch concentration in coarse roots was the smallest (50%), followed by xylem (72%), fine roots being the largest. (2) Under shading, NSC concentration in different tissues/organs of the seedlings all dropped by over 50%, but the survival of the seedlings remained 100%; the change of biomass in the seedlings after shading showed no significant difference, only NSC pool narrowed, and NSC relative distribution modified; after shading, NSC in different tissues/organs declined to varied degrees, NSC concentration of coarse roots being significantly higher than that of fine roots. (3) After light restoration, NSC concentration in the tissues/organs of the seedlings returned to an equivalent level with the control. According to the research, under shading conditions, seedlings of C. lanceolata could actively adjust their NSC distribution in different tissues/organs so that it remained in a certain range, thus enhancing their own adaptability to the shaded environment but not at the expense of growth.