With the development of the three-gorge project,a new large-area and distance monitoring model that use the internet as its information medium is presented under the request of national water quality monitoring work.This kind of model is a combination of the GIS,GPS technology,the network communication technology and the data-base technology.It can not only perform the auto-data acquisition and issue the information conveniently,but also carry out the statistic work and data analysis.So the ability of real-time monitoring could be promoted.It's also convenient to emergent locating with the GPS technology.And more proper redistribution though optimizing the distribution of the monitoring points with improved TOPSIS model and classifying monitoring points.Then,it is executed by lower cost.