Abstract： Geostatistical methods and GIS are used to analyze the spatial distribution of the rice water weevil (RWW) in the 1st rice crop season in Zhejiang and Fujian province from 1993 to 2001. The results show that the RWW population is mainly distributed in coastal regions,its spatial patterns are aggregated throughout the study periods and distribution patterns change with time. The area occupied by this pest is about 392,100 ha in 1993 which increase continually to a maximum of 2,533,900 ha in 2001. The RWW population initially spread south along the coastline,then north. It has now invaded about 26 counties including 190 villages and towns.In general,the risk to rice crops posed by the RWW population is higher in south and lower in north; it is highest in Yuhuan,Leqing and Wenling from 1993 to 2001.RWWs spread mostly along roads and waterways,which suggests that it is transported by human activity and therefore that its rate of spread may be controlled by better managing the transport of people and produce.