A brief introduction of World Meteorological Organization (WMO),its purposes,function as well as its service were given.As one of the Specialized Agency of UN,WMO guides and coodinates its member countries′meteorological work by formulating a series of technical rules and regulations,standards,guidances;by seting up some important programs such as "World Weather Watch" and "World Climate Program".China as one of important member of WMO,has made its due contribution to WMO and international meteorological community.WMO′s role is highly recognized which has been guiding and assisting the development and modernization of China′s meteorological work.