Abstract: San-Chi, the rhizoma of Panax notoginseng (Burk,) F. H. Chen. is a well known Ghinese traditional drug. In recent years, San-Chi has been used for treatment of angina pectoris, so we studied the constituents of this drug.β-Sitosterol, daucosterol, quercitin, a glycoside of quercitin, (Glucose, xylose and glucuronic acid present in the sugar moeity) sucrose and six saponins (Sanchinosides C₁,C₃, D₁, D₂, E₁ and E₂) were isolated from the root hairs of Panax notoginseng (Burk.) F. H. Chen. Sanchinoside C₁ and E₁ were found to be identical with ginsenoside-Rgl and-Rbl respectively. The saponin sanchinoside D₁ (20-S-protopanaxatriol, glucose, xylose and rhamnose) was not found in the roots, flowers, buds and leaves of Panax spp. Studies of the chemical structure of sanchinoside D₁ is in progress. Sanchinoside-C₃, D₂ and E₂ have been isolated only in small amounts.