Since the prediction of wind power only by local NWP and historical observations has saturated, the spatial correlation approaches, which employ the wind speeds and directions of surrounding areas, become the main methods to improve the prediction of wind speed in the future. To improve the spatial correlation prediction by characteristics of monsoon is very important for China, because the 2/3 area, the littoral and northern part of wind energy resources rich areas as well as the major energy consumption areas of China are all located in monsoon regions. The wind speed time series between different places are obviously similar after some lag time. The optimal lag time can be calculated by the correlation coefficient and mutual information, which can improve the spatial correlation prediction. In the monsoon durations, the optimal lag time of wind speed from Changjiangao to Zhanjiang is about 20 hours, which is significantly larger than the typical 4 hours in Europe and America.