To study the chemical constituents of the leaf of Clausena lansium (Lour.) Skeels. The compounds were isolated by various chromatographic techniques and their structures were elucidated by their physicochemical properties and the analysis of their spectroscopic data. Seven compounds were isolated and identified as corchoionoside C (1), 1'-O-beta-D-glucopyranosyl (2R,3S)-3-hydroxynodakenetin (2), quercetin-3-O-robinobioside (3), rutin (4), quercetin-3-O-scillabioside (5), keampferol-3-O-alpha-L-rhamnopyranosyl(1-->2) [alpha-L-rhamnopyranosyl(1-->6)]-beta-D-glucopyranoside (6), mauritianin (7). Compounds 1-7 were isolated from the genus Clausena for the first time.