If DHF adult patients have mental disorder, tachycardia ³ 120times / min, tachypnea ³ 28times / min, recurrent shock, decrease in hematocrite £40%, prolonged Prothrombin time ³ 20sec, prolonged APTT ³ 60sec and lactatemia ³ 5mEq / L, clinical doctors should pay attention to digestive, vaginal and nasal bleeding in order to give diagnosis and treatment timely the major heamorrhagic cases to decrease mortality rate.