The main circulation patterns of the drought can be concluded as follows: the subtropical high weakening and its position northward shifted compared to normal, the midlatitude zonal circulation prevailing and Mongolia cold vortex scanty. Using the Asian circulation index, the northern polar vortex position and climatic characteristics of summer precipitation, based on the data of summer (June to August) precipitation from 1959 to 2000 at 10 meteorological stations in Chifeng, according to local climatic characteristics, the drought intensity was divided into two grades of slight drought and severe drought, and then by the stepwise correcting method, the drought intensity is predicted by use of the above three series of factors. Results verify that the method has the definite ability of forecasting summer drought intensity through the practical utilization from 2001 to 2007.