A prevalence study on Hepatitis B virus (HBV) and Hepatitis C virus (HCV) infection in 144 patients with hemopathy was carried out, using an enzyme linked immunosorbent assay (ELISA). The HBsAg, HBcAb and anti-HCV positive rates in sera of these patients were 9.72%, 36.81% and 24.31% respectively, comparing with data from healthy control subjects, 12.03%, 46.30% and 0.93% respectively. No correlation between HCV infection and patient's age or sex was noticed. Nevertheless the incidence of HCV infection was closely related to the history and the frequency of blood transfusion. The ALT level in sera of patients with HCV infection was higher than that of patients without HCV infection. The ALT level in sera was the highest in patients superinfected with HBV and HCV. Our results suggested that blood transfusion and receiving blood products were important routes of HCV transmission in patients with hemopathy.