purpose:To investigate the stasis of Chinese medicine in patients with primary dysmenorrhea hemorheology.Methods:35 patients with primary dysmenorrhea patients aged between 18-24 years old,mostly school and high school students,Well its two days before menstruation Traditional Chinese Herbal oral granules daily one, even the service 4 days.Take three consecutive menstrual cycles.The clinical efficacy,and test patients before and after the blood rheology.Results:35 cases of primary dysmenorrhea clinical total effective rate was 943%;blood rheology showed:plasma viscosity, different shear rate whole blood viscosity,hematocrit and erythrocyte aggregation index was significantly lower maximum;maximum deformation of red blood cells capacity increased(P＜001);fibrinogen,although there are different degrees of change,but not statistically significant.Conclusion:The main pathogenesis of primary dysmenorrhea and blood high “concentration,viscosity,coagulation and set”state related to Traditional Chinese Traditional Medicine has improved blood viscosity,reduced blood viscosity,improve microcirculation in the uterus,so that pain ease.