[Objective]The research aimed at analyzing the chemical components and their relative content of volatile oil from Senecio jacobacea L.[Method]The volatile oil was extracted from Senecio jacobacea L.with steam distillation and analyzed by GC-MS.[Result]Thirty compounds were identified from the volatile oil,and the major compositions were aromadendrene oxide-(2)(22.17%),aristolene epoxide(11.25%),caryophyllene oxide(7.56%),7R,8R-8-hydroxy-4-isopropylidene-7-methylbicyclo[5.3.1]undec-1-ene(7.36%),(-)-spathulenol(6.01%),and aromadendrene oxide-(1)(5.35%).[Conclusion]The chemical components and their relative content of volatile oil from Senecio jacobacea L.were obtained,which would provide the basis for comprehensive development and utilization of Senecio jacobacea L.. [Objective] The research aimed at analyzing the chemical components and their relative content of volatile oil from Senecio jacobacea L. [Method] The volatile oil was extracted from Senecio jacobacea L. with steam distillation and analyzed by GC-MS. [Result] Thirty compounds were identified from the volatile oil, and the major compositions were arondndrene oxide- (2) (22.17%), aristolene epoxide (11.25%), caryophyllene oxide (7.56%), 7R, 8R-8-hydroxy-4-isopropylidene- 7-methylbicyclo [5.3.1] undec-1-ene (7.36%), (-) - spathulenol (6.01%), and aromadendrene oxide- (1) (5.35%). [Conclusion] The chemical components and their relative content of volatile oil from Senecio jacobacea L. were obtained, which would provide the basis for comprehensive development and utilization of Senecio jacobacea L.