To provide the chemical data for resources development of Stephania mashanica

its chemical constituents were investigated;Method: The powered tuber of S.mashanica were extracted with 2% H2SO4-H2O and purified by silica gel

alumina oxide and Sephadex LH-20 column chromatograph.The structures were elucidated on the basis of spectral analysis and physico-chemical evidence.Result: Seven alkaloids were isolated from the thin sulfuric acid extracts of the fresh roots of Stephania mashanica

these alkaloids were identified as dicentrine（1）

(（）-crebanine（2）

sinoacutine（3）

tetrahydrocolumbamine（4）

tetrahydropalmatine（5）

palmatine（6）

and jatrorrhizine（7）.Conclusion: compounds 2-7 were obtained from this plant for the first time.