简介：Producinggoodsandservicesallneedswaterconsumption.Thewaterusedintheprocessofanagriculturalorindustrialproductiscalledthe"VirtualWater"containedinthisproduct.Throughinternationaltrade,water-scarcecountriesandregionscouldpurchasewater-intensiveproducts--especiallyfoods,fromwater-richcountriestobalancetheirwaterdeficitsandachievewatersafety.Chinaisoneofthe13mostwater-deficitcountrieswhosewatersafetyhavebeenseverelychallenged.Thispapergeneralizedtherecentglobalresearchdevelopmentandmadeabriefintroductionaboutthemethodscalculatingvirtualwatercontentinspecificproducts.Asacasestudy,wequalifiedChina'sannualvirtualwaterflowsfromyear2000to2002withtradeincrops,andendedwithsomepolicyadviceforapplicationandpracticeofvirtualwaterstrategy.