Objective: To study the chemical constituents in Ipomoea pes-caprae. Methods: The chemical constituents were isolated and purified by chromatographic methods and their structures elucidated by physiochemical property and spectral data. Results: Nine compounds were obtained and identified as batataoside Ⅱ( 1),batatoside Ⅲ( 2),stoloniferin Ⅹ( 3),stoloniferin Ⅸ( 4),3-hydroxy-5,7,4'-trimethoxy flavonoe( 5),3,7-dihydroxy-5,4'-dimethoxy flavonoe( 6),3,7,4'-trihydroxy-5-methoxy flavone( 7),daucosterol( 8)and β-sit...