Abstract: The root bark of Daphne genkwa Sieb. et Zucc. (Thymelaeceae) has been used as remedy for ascites of the late stage schistosomoiasis. Three crystalline substances have been isolated as follows: (1) The first, mp. 135℃, has been identified as ,β-sitosterol. (2) The second, C₂₇H₃₀O₁₄ (0.09%), possesses double melting points 186℃ and 270℃.From the studies of its chemical and physical properties, it is proved to be a new flavone glycoside, genkwanin-5-glucoxyloside or genkwanin-5-xyloglucoside, and is named Yuenkanin. (3) The third is a phenolic compound, C₁₅H₁₄O₆ (0.04%), mp. 192℃,which possesses the activity of fish poisoning and coronary vasodilation.