Abstract: Using the NCEP/NCAR reanalysis monthly data，NOAA monthly sea surface temperature data and monthly rainfall station data in the Hexi Corridor from 1961 to 2010，the variation characteristics of precipitation in late spring and early summer and relationships between precipitation anomaly and the atmospheric circulation and sea surface temperature in early spring are statistically analyzed. The results show that the variation trend of precipitation in late spring and early summer is consistent in the region-wide and there are significant periods of 3，5，10，13-15 years in time change. In positive precipitation anomaly years，characteristics of circulation and sea surface temperature are that the east wind prevails and the region-wide is under the control of convergence in the Hexi Corridor at 850 hPa wind anomaly field. there was’+-+’ anomaly pattern in mid-high latitude over Eurasian at 500 hPa height anomaly field and this distribution is similar to negative Eurasian teleconnection pattern (EU). Meridional circulation of wind anomaly is ascending over India Ocean，descending over Tibetan Plateau and ascending 35°～45°N. The central China is under the control of the east wind at the whole layer water vapor flux anomaly field which is conducive to water vapor transport from eastern to northwest China and Hexi Corridor is smothered in water vapor convergence area. The sea surface temperature of southern equatorial India Ocean and the mid-eastern equatorial Pacific in early spring is in positive anomaly. In negative precipitation anomaly years，characteristics of the atmospheric circulation and sea surface temperature are opposite. The correlation analysis of sea surface temperature in early spring and 500 hPa height in late spring and early summer show that southern equatorial India Ocean SSTA plays the crucial role in stimulating and enhancing the mid-high latitude Eurasian teleconnection pattern （EU）. This is possible cause of the precipitation anomaly in late spring and early summer in the Hexi corridor.

Key words: Hexi Corridor, precipitation, atmospheric circulation, water vapor transport, sea surface temperature