The method and operational flow of monitoring large-scale drought in Yunnan by using NOAA/AVHRR data are presented.Meanwhile key problems,such as index of distinguishing drought,method of area estimation,identification of crop drought and derivative of image product,were discussed.According to detailed analysis on monitoring product in the spring of 1999 in Qujing region,it was proved that using satellite Remote Sensing technique to monitor area, degree and allocation of large-scale drought is available in Yunnan.