It is mainly on 500 hPa isobaric surface,its horizontal scale is from 400 to 500 km,its life circle is from one to three days,and temperature structure of most plateau vortex is warm.

• 结果表明:高原上较强的边界层动力“抽吸泵”作用对高原低涡的流场结构及发展有重要影响。