Clinical analysis of 144 cases of malignant malaria in June to October. 1982 and 1983 was reported. The chief clinical features were fever, headache, sweating, hepatomegaly, splenomegaly, rigor (50%) and jaundice in one case. Abdominal pain and vomiting occurred in about 25% cases. Convulsion occurred in one case and coma in seven patients of cerebral type. Laboratory findings were anemia (48.9%). thrombocytopenia (58.4%). increased plasma viscosity (55.6%) and decreased whole blood viscosity (79.4%). There were also pathological sign; of eye blood vessels. 137 patients were infected with malignant malaria alone, and 7 in combination with vivax malaria. The cases were divided into 3 treatment groups:(1) Single dose of Artemether (300 mg intramuscularly) in combination with antima-larial Ⅱ (5 tablets orally). (2) Artemether (200 mg daily im). 3-days course, and (3) Chloroquine (total dose 1.5 gm base orally) 3-days course. All patients ultimately recovered, while the first group had the best therapeutic effect. The epidemiologic feature, treatment and pathogenesis of malignant malaria were discussed.