The theme for World Meteorological Days (WMD),2002 is "Reducing vulnerability to weather and climate extremes ". In the light of this theme, the following four problems are in general illustrated: (1) definitions of weather and climate extreme events; (2) changes in weather and climate extremes for the past 100 years on the global basis, and their association with global climate change ;(3) projection of global weather and climate extreme events for this century; and (4) adaptation and mitigation response strategy for reducing vulnerability to weather and climate extreme events. Due to space limitation, studies in this regard made by Chinese scientists have not included.