In this paper,the lung cell A549 was used as a model.The protective effect of camphor(C.camphora)leaf essential oil on the A549 exposed to PM2.5 was investigated.Less than 1 mg/mL of essential oil had no effect on A549 cell proliferation,and low concentration had a certain promotion effect.0.05~1.00 mg/mL essential oil had a significant antagonistic effect on cytotoxicity induced by PM2.5(P