Abstract: In November 1983, indirect fluorescent antibody test(IFA) was carried out to detect the malarial antibody level in the population of Dabao Village, He County, Anhui Province. In this test, both antigens of Plasmodium falciparum(Pf) cultured in vitro and Plasmodium cynomolgi(Pc) were used, in addition to routine thick blood smears.The IFA-positive rate for the investigated population of the village is 67.0% and 81.3% for Pf and PC antigens, respectively. In the age group 0-15, the rate is 41.8% for Pf antigen and 62.7% for PC. Above the age of 16, the rate is 82.6% for Pf and 92.7% for PC. The results indicated that the level of malarial antibodies in the population was rather high. Thick blood smear examination of 178 subjects showed that the positive rate was 23% among which 29 cases were infected with Pf(16.3%), 10 cases with Pv(5.6%) and 2 cases with mixed infection(11l%). It was concluded that the area must have had a recent episode of malaria.