The incubation period of hemorrhagic fever is 4-46 days, usually 7-14 days, with 2 weeks being more common. In typical cases, there are five phases in the course of the disease: fever, hypotensive shock, oliguria, polyuria and recovery, but atypical cases are more common, so there can be transgression and overlap with each other. According to the level of fever, the severity of toxic symptoms and the severity of renal impairment, it can be divided into five types, including light, heavy, medium, critical and atypical. Treatment is based on comprehensive treatment, with early application of antiviral therapy and symptomatic treatment in the middle and late stages to achieve the principle of early detection, early treatment and proximity of the disease, and must prevent and treat shock, renal failure and bleeding during the treatment process.