The purpose of this article is to analyze the situation and reasons of security of drinking water.Survey data of insecurity of drinking water for every village conducted by water conservancy instituttoins were used in this study,and the geographic information systems of security of drinking water were constructed by using ArcGis9.3 software.By comparing the data in 2005 and 2009,the article draw the following conclusions: Although the population of insecurity drinking water decrease significantly,but it sti...