Abstract: There were 1893 patients with epidemic hemorrhagic fever（EHF） in ovr hospital frorn January 1985 to April 1993,and 791 cases among them were complicated with hypertension. The incidence rate was 41. 8 % .and most of than were mild or moderate hypertension. The hypertension was usuallyfound 9 days after the onset of EHF （86. 2% ）. The longestcourse lasted for 45 d. The prognosis of hypertension was verygood. Propranolol and captopril can shorten the hypertension course according. Preventive use of propranolol can reduce the incidence of hypertension. The mechanism of hypertension may be related to the damage to kidneys by EHF viruses or immunocomplex.