Abstract: It is an extremely important and valuable work to develop advanced remote sensing system of macrophysical and microphysical cloud characters.A new method is proposed to observe cloud base height through g round-based double location dig ital photography system.In this system, cloud height is calculated in real time from displacement between two matching templates which are automatically searched from two all-sky nephog rams.Consistency is show n between cloud heights observed through double location and those through lidar in Luogang airport of Hefei.According to measurement error of cloud height, the observation should be performed under the preferential observing condition with baseline length as long as possible but less than 200 m, and angle of view variable in ±45°.Furthermore, the excellence and limitation of this method are discussed.