Abstract: Extractionstudyonchemicalconstituents ofvolatileoilfromNasturti umofficinaleR.Brwas carriedout.T he volatile oil was extracted fromNasturtiumofficinale R.Br.By steamdis tillation and analysed with the optimumsepa-ratingandanalyzingconditionsbyG C -MS.Thenthepercentagecontentofcompositionofvolatileoilwasdete rminedby normalization method by GC.And the c onstituents were idendfied by GC -MS .60components were separated,iden-tifiedandaccountedfor over60.82%oftotalvolatileoil.Byanalyzingt hevolatileoilofNasturtiumofficinaleR.Br.the scientific foundations were provid edfor further developmentof the pla ntto be utilizednotonly as a kindoffoodbutalso a kind of medicine.

Key words: Nasturtiumofficinale , R.Br.Volati le oil , GC -MS