The climate comfort index(CCI)is the influencing degree of climate conditions on the human feeling.Based on the average values of temperature,wind speed,relative humidity of 13stations in Weihe Riverbasin during 1961-2010,CCI values were calculated for each station and days,duration and spatial distribution were also examined at all levels of CCI values.The results showed that the number of cold and very colddays was reducing and the comfortable days were increasing slowly,which is closely related to the air temperature changes.Except for Huashan Mountain station,CCI values were relatively high and the comfortabletime was longer than 5months per year for all the stations.On average,the number of days when CCI valuereached comfortable level accounted for 46.9%of the whole year,while cold and very cold days for 27.1%.There were no days with CCI values reaching hot or very hot.Spatially,CCI values were relatively higher atthe stations of Xi'an,Wugong,Tianshui and Baoji,followed by stations of Tongchuan,Luochuan and Huanxian County.