Bougainvilleas are ornamental,as well as health-friendly.To explore the mechanisms of secondary-metabolism in Bougainvillea,the volatile components of four species of Bougainvillea (Bougainvillea glabra ‘Magnifica’,Bougainvillea ‘Pink Pixie’,Bougainvillea glabra ‘Formosa’ and Bougainvillea×buttiana ‘Mahara’) extracted by distillation were analyzed by GC-MS.Through quantitative analysis and qualitative analysis,85 chemicals were separated.And after searching NIST database,72 chemicals were identified which account for 90% of total.Of them,there are more than one health-friendly chemicals including Phytol,Vitamin E,9,12-Octadecadienoic acid (Z,Z),Eugenol and 9,12,15-Octadecatrienoic acid(Z,Z,Z) in the flowers of Bougainvilleas.