Abstract: Hemorrheologic studies have been carried-out on 73 cases of cutaneous vasculitis and AO cases of Behcef's disease.The results showed that both groups of patients;had uniform change. The whole blood reduced viscosity, plasma relative viscosity, fibrinogen, erythrocyte electrophoretic time, ESR and coefficient K of ESR equation were higher, while the Iiematocrit was lower than those of normal controls. When these diseases were in remission, the values of whole blood reduced viscosity and fibririogee. went down. All these data,mentioned above are statistically significant.