Drought is a major disaster that Beijing agricultural systems faced with. The risk of drought disasters is a result of drought disaster together with vulnerability, the result of drought disaster only appeared in post-disaster, before the disaster occurred, we need to make some research on drought vulnerability that Beijing agricultural systems faced with, we choose VAM (vulnerability assessment method) that consist of three drought elements: exposure, sensitivity and adaptive capacity, based on two kinds of analytic hierarchy process method to determine the weight of each factors. try to verify the results of agricultural drought indicator system through the spatial distribution map of soil moisture, as well as explore the key factors that influence Beijing agricultural drought vulnerability.