Abstract:Objective: To study the chemical constituents of Mentha haplocalyx. Method: The chemical constituents were isolated and purified with column chromatography and the structures were elucidated by spectral analysis. Result: Nine compounds were obtained and identified as emodin ( Ⅰ ), chrysophanol ( Ⅱ ), physcione (Ⅲ), benzoic acid (Ⅳ), trafis-cinnamic acid ( Ⅴ), β-sitosterol (Ⅵ), aloe-emodin ( Ⅶ), ursolic acid ( Ⅷ) and daucosterol (Ⅸ). Conclusion: Compounds Ⅰ , Ⅱ , Ⅲ , Ⅴ ,Ⅶ were first isolated from M. haplocalyx.