Abstract:

According to statistical analysis of the seasonal change of the SouthAsia high，the date of the first regional precipitation over
10 mm（the first soaking rain）in spring and the date of changing to more rain period in early summer in Gansu province，the paper reveals the correlativity primarily among the South Asia high during its seasonal change and setting up above Qinghai-
Tibet Plateau，the first soaking rain in spring and changing to more rain period in early summer in Gansu especially in the east region of the River.
Analyse results indicate that there is remarkable relation between the South Asia High visiting the Middle-Southern Peninsulas during its seasonal change and the first soaking rain in spring in Gansu，and between the South Asia high setting up above Qinghai-Tibet plateau and changing to more rain period in early summer in Gansu as well.So it’s important to know the seasonal change of the South Asia high and the date of its visiting the Plateau for us to predict the appearance of the first soaking rain and the date of changing to more rain peiod accurately.

Key words: South Asian High, Gansu, the precipitation in spring, earlysummer

摘要：

关键词: 南压高压, 甘肃, 春季和初夏降水