Abstract: A correspondence analysis method is applied to dealing with groundwater quality data.It is shown that the groundwater in the research area can be classified as follows:(1)weak alkalinity with low TDS value;(2)strong alkainity with relatively high TDS value,and(3)interg rade between(1)and(2)above mentioned. According to the feed-back information,the existing ground-water quality monitoring points seem to be more than necessary.The optimal analysis is made on the basis of the detailed water quality types,TDS values and the related water-environment characteristics.Although the water quality monitoring points are less than before,they can still reveal the main information from the existing ones,by regular monitoring.