简介：XiliaoheRiverwatershedplaysanimportantroleinregionalandnationalgrainsecurity.Withthedevelopmentofsocietyandeconomy,waterconsumptionthatincreaseddramaticallycauseswatershortages.Cropwaterrequirementcanprovidequantitativebasisformakingregionalirrigationscheme.Inthisstudy,springmaizewaterrequirementiscalculatedbyusingPenmanMonteithformulaandspringmaizecoefficientfromMaytoSeptemberat10meteorologicalstationsinXiliaoheRiverwatershedfrom1951to2005.Thevariationtrendofthespringmaizewaterrequirementduringthewholegrowingstage,waterrequirementineverymonth,andmeteorologicalinfluencingfactorsareobtainedbyusingMann-Kendallmethod,andthedegreeofgreyincidencebetweenthewaterrequirementandmeteorologicalinfluencingfactorsareshown.TheresultsarethespringmaizewaterrequirementduringthewholegrowingstagesincreasesathalfofthestationsinXiliaoheRiverwatershed,andareremarkablyaffectedbythewaterrequirementinMay.Themonthlymean,maximumandminimumairtemperatureformMaytoSeptembershowanincreasingtrendinXiliaoheRiverwatershedinrecent55years.Themonthlymeanandminimumairtemperatureincreasesnotably.Therelativehumidity,precipitation,windspeedandsunshineshowadecreasingtrendwithvarietyfordifferentmonths.Themonthlymaximumairtemperature,windspeed,sunshineandmonthlymeanairtemperaturehavethehighestcorrelationdegreewithspringmaizewaterrequirementfromMaytoSeptember.