Water is a human survival and development of important resources．Isindispensable，irreplaceable special resources．There is no life，the progress of civilization，the development of economy and the stability of society without water．Water can not be used unlimited and exceeded the capacity of water resources which are limited．the development of economy and society must be adapted to the provison of water．Nowdays．with the growing population and developing economy,freshwater resources are increcing demanded；At the same time．shortage of freshwater resources have become increasingly tense as a result of unreasonable using．
Wireless IC smart card displaying improtant role in our society espacially in fanance and economy fieled．Now, our city advocates establishing an abstemious society．On this account，the equimen for saving Water merges as the times require．
Water-saving control systern uses single-chip controled．This system can accomplish many functions，such as accountting in accordance with the time, showing the balance of smart card，alarmming automaticlly and so on；Charges in a fair and reasonable way have important significance．dynamically displaying the user's account balance remind him water consumption，which greatly enhanced people's awareness of water conservation，especially on the issue of waste water in public places is a good solution，thereby enhancing the water-saving efforts in order to adapt to the needs of the development of our society, to achieve the necessary water for the department to eliminate waste．
