Abstract: The evapotranspiration climate productive potential (TSPV) was calculated based on Thornthwaite Memorial model and the data from 127 meteorological stations during 1961 to 2008 in Huaihe river basinThe temporalspatial distribution regularity and change trend of TSPV were analyzed in this paper.The results indicated that TSPV variation was accordant with the variation of annual precipitation,which had zonal decrease in latitudinal direction.Both extreme precipitation and the number of heavy rainfall days have a significant positive correlation with TSPV.In most areas,TSPV was positively correlated with heavy rainfall intensity and annual times of 5 over days of continuous rainfall,which had a negative correlation with annual times of 15 over days of no rainfall in northwest part of Huaihe river basin and partial eastern coastal areas

Key words: Huaihe river basin, Extreme precipitation, Climate potential productivity