In the World Meteorological Day (WMD), a topic is chosen by WMO every year since 1961 for the public in the world to enhance the understanding of the importance of the meteorological problem concerned. The topic in 2004 is: Weather, water and climate in the information age so as to improve the people's knowledge about the role of water in the sustainable development, the relationship between water, weather and climate, the effect of information transportation in the information age.