Global climate has been warming up persistently in recent years. The year of 1997 was the warmest year throughout the century. The strongest El Nino episode occurred in the central and eastern Pacific and it has a significant impact on world climate. Especially in the tropical regions,extreme climate events such as hot weather and drought,storms and floods frequently occurred,which resulted in severe disaster.During the early winter,cold and snow weather was experienced in Europe and North America. In summer,storms frequently occurred in Europe and central Europe was hit by the century flood. Persistent high temperature weather and drought appeared in northeastern Asia. The western United States was hit by the severest flood of the recent decades,and the border between the USA and Canada was stricken by the severest flood of the recent 100 years.