Objective To explore the correlation between vaginal bleeding during early pregnancy and abortion of Macaca fascicularis. Method The Statistic results of the incidence of early pregnancy bleeding and abortion rate were worked out by observing the normal menstrual and the vaginal bleeding during early pregnancy. Then the correlation between vaginal bleeding during early pregnancy and abortion of was investigated based on the results. Results The ratio of Macaca fascicularis bleeding in the first menstrual cycle was reached 80% of the total amount of pregnancy, while the abortion rate was 0%. Conclusion Since the vaginal bleeding in early pregnancy was one basic phenomenon of Macaca fascicularis, it was have no effect or little impact on pregnancy security.