Abstract:2007 is the warmest year since 1951. In the spring of the year, the fr equency of the dust storm is less. And in the summer, extreme heavy rainfall eve nts occurred in many regions, especially along Huaihe river valley. But severe d rought occurred in South China in the autumn. During the whole year, the number of the tropical cyclones (TC) developed from the South China Sea and the western Pacific is less. Among them, eight landed on China. In 2007, the equatorial eastern Pacific experienced an El Nino event in January but La Nina event started s ince August. In the high latitudes of Northern Hemisphere, the geo-potential hei ght anomalies are positive and the zonal circulation prevails in most months. Th us the cold surges are not frequent. In the summer especially in July, the weste rn Pacific subtropical high was stronger and locates over South China stably. Th is is propitious to the transportation of warmer/wetter moisture from the Bay of Bengal to China. But on the other hand, during this period the South China expe rienced an extreme high temperature and drought event due to the stability of h igh pressure. In 2007, the South China Sea summer monsoon onset at the 5th pentad of May and withdrew at the 3rd pentad of October, both are later. Owing to the weak monsoon in July, the warmer/wetter moisture can only be transported to the Huaihe river valley and formed a convergence over the area. Thus the flood event occurred in the area. 