Water calamity,a kind of natural or artificial calamities related to water,is created by over or less water,flow energy,chemical compositions of substance in water,or interaction between water and its medium.Water harm generally means flood and drought.Extensive meaning of water harm also include water and soil landslide,debris flow,artificial water harm and so on.The reasons that cause water calamity in eastern region of Qinghaiporvince are discussed in this paper so that more attention should be payed to the water harm in this area' The prevention and control measure for water harm should be strengthened,and researches should be concerned.