VOL.28NO.10OCT.20046250thAnniversaryofCAUPDCONTROLANDPLANOFCITYWATERSYS-TEMSHAOYishengToconstructanacademicframeworkofcitywatersystemundertheguideofsystematictheories,thispaperanalyzestheconcept,elements,structure,functionandcharacteristicsofcitywatersystem.Thenitdiscussesthebase,approachesandstrategiesofcontroloncitywatersystem.watersystem;control;planning;city63Fig.2CirculationofwaterFig.1StructureofwatersystemVOL.28NO.10OCT.20046450thAnniversaryofCAUPDFig.3FeedbackmechanismofwatersystemFig.4Improvedwatersystem65Fig.5AuxiliarycontrolsystemofwatersystemVOL.28NO.10OCT.20046650thAnniversaryofCAUPD67