潼南县位于四川北部，东径106°0′26″，北纬30°26′28″。以方山丘陵为主。年平均气温为17℃，年降雨量为978mm。传疟媒介为单纯中华按蚊。解放后仅50年代发生过间日疟流行，发病率达135.7/万（1952年）。以后至1987年，发病率一直稳定在0～2.4/万之间。为了解我省低疟区的发病特点，更好地采取防治对策，将全县近三年发生的141例间日疟病例流行病学资料分析如下。 Tongnan County is located in the northern part of Sichuan Province, with an east path of 106 ° 0’26 “and latitude 30 ° 26’28” north. Fangshan hills. The annual average temperature is 17 ℃, the annual rainfall is 978mm. Transmission of malaria vector to Anopheles sinensis. After the liberation, vivax malaria occurred in the 1950s alone with a prevalence of 135.7 / million (1952). After 1987, the incidence rate has been stable at 0 ~ 2.4 / million. In order to understand the characteristics of low incidence of malaria in our province and to take better prevention and control measures, the epidemiological data of 141 malaria cases in the past three years in the county were analyzed as follows.