Objective:To investigate the chemical compositions of the leaves of Syringa oblata. Method: The separation was performed by using silica gel column chromatography

recrystallization and the HPLC preparation methods. The compound structures were identified according to the spectral analytical methods UV

IR

1H-NMR

13C-NMR

HSQC and HMBC. Result: The structures of the nine compounds were fully determined by the chemical and physicochemical evidences. They were (+)pinoresinol-4″-O-β-D-glucopyranoside(1). lariciresinol-4-O-β-D-glucopyranoside (2). (+)epipinoresinol-4-O-β-D-glucopyranoside (3). 3

4: 3'

4'-bis(methylene-dioxy)-9'-hydroxyl-lignane-9-methyl-O-β-D-glucopyranoside (4). 2-(3

4-dihydroxyphenyl) ethyl (1R

4aS

8R

8aS)-8-methyl-6-oxo-1-[(2S

3R

4S

5S

6R)-3

4

5-trihydroxy-6-(hydroxymethy)oxan-2-yl]oxy-4a

5

8

8a-tetrahydro-1H-pyrano[3

4-c]pyran-4-carboxylate(5). 3

4-dihydroxybenzene-Styrene glycol (6). 4-hydroxyphenethyl alcohol (7). 6-O-(E)-feruloyl-(α)-glucopyr-anoside (8). 6-O-(E)-feruloyl-(β)-glucopyranoside (9). Conclusion: All of the constituents are obtained in leaves of S. oblata; among them

compounds 1-6 are reported in this species for the first time.