Abstract: The present paper has analysed the process of the development of a cold surge over the South China Sea and the West-pacific after an outbreak of cold air occurring during 21-28 January 1981. The initial development of the cold surge showed up in the rapid establishment of low-level strong northerly wind off the seaboard of East Asia and over the central and northern parts of the South China Sea. The duration of the cold surge is short, persistent for about 3-4 days:then the second cold surge was induced over the oceanic area to east of the Philippines, with longer duration of about 6-7 days. Accompanying the wind field of cold surge, the temperature field at low-level also showed a remarkable variation, characterized by two processes of cooling. The upper-air winds during the cold surge also indicate an obvious fluctuation. Over the northern part of the South China Sea the rapid decrease of upper-level westerly wind was observed as the cold surge developed. while over the near-equatorial region the most remarkable feature is characterized by establishment of strong upper east wind. The development of the cold surge is associated with the southward invasion of cold high. Its intensity is to a greater extent dependent on the intensity of cold high in mid-latitude. On the other hand, as the cold surge developed, it may exert an effect on the variation of mid-latitude westerly jet and tropical east jet.