The present invention belongs to the field of biomedicine preparation, relates to the new use of Cyclosporin A, and is specifically the application of Cyclosporin A in preparing anti-abortion medicine. The intracorporeal and extracorporeal experiments on natural abortion model probes that Cyclosporin A produces anti-abortion function via inducing mother-fetus interface Th2 effect and mother-fetus immune tolerance, has obvious proliferation stimulation to extracorporeal growth of mother-fetus interface nourishing cell in the human progrestation, and can change cytobiological period and rhythmicity of nourishing cell while increasing its invasiveness. Cyclosporin A may be used as anti-abortion medicine clinically. |