Abstract:Objective To study the chemical constituents from mangrove Excoecaria agallocha.Methods The chemical constituents were separated and purified by chromatographic methods after solvent extraction and were identified by spectroscopic analyses (EI-MS, 1D NMR).Results Twelve compounds were isolated from this plant and identified as:14-taraxeren-3-one(Ⅰ),dibutyl phthalate(Ⅱ),β-amyrin(Ⅲ),18-oleanen-3-of(Ⅳ),18-oleanen-3-one(Ⅴ),phaeophytin A(Ⅵ),betulin(Ⅶ),β-rosasterol(Ⅷ),β-sitosterol(Ⅸ),betulinic aicd(Ⅹ),oleanolic acid(Ⅺ),ursolic acid(Ⅻ).Conclusion Compounds Ⅶ、Ⅷ、ⅩandⅫ are isolated from this plant for the first time.