Global climate model data, including historical climate simulation data and RCP2.6, RCP4.5 and RCP8.5 future estimation data from The Fifth Phase of the Coupled Model Intercomparison Project (CMIP5) were used to analyze the dry/wet variations of seven typical areas of the East Monsoon Area of China from 1901-2100 on a humid index detecting the dry/wet condition at the surface. It was found that from 1901-2005, the humid index in each partition gradually decreased. The humid index decreased slowly in the Pearl River, Yangtze River, Huaihe River, and downstream of the Yellow River. The humid index was volatile in the Yellow River, Haihe River and the northeastern region. Therefore in the past 100 years, the East Monsoon Area of China was in drought condition. The model predicts that from 2006-2100, under different scenarios of greenhouse gas emission, the humid index in all partition will be volatile, while upstream of the Yellow River the humid index will gradually increase from 2006 to 2100, changes in the remaining regions will not be significant.