In the Hainan drug-resistant malaria area

a project of 3-day’s course treatment（Qing- haosu 5.4 g orally or 0.8-1.0 g intramuscularly）was administered to 65 chloroquine- resistant malarial cases

including local children and outside adults.It is more effective as compared with those treated by Pyronaridine phosphate at the sameperiod.The authors hold that this is a better and safer project.The anti-malarial effect of Qinghaosu

the recrudescence after treatment and the factors affecting its effect are analyzed and discussed. It is suggested that Qinghaosu is a schizonticide.It must be used in combination with primaquinine in order to eradicate gametocyte of malignant malaria and prevent the recurrence of tertian malaria.