| Abstract: Based on the introduction of theory of frequency combination method, the paper analyzes the influence factors of drought occurrence and the features of this method,and demonstrates the feasibility of applying this method in drought analysis.By using the frequency combination method in Jinghe Basin,a new drought variable is formed with precipitation and natural runoff.Through combination and calculation,the condition of drought co-occurrence of precipitation and runoff can be predicted under different frequency,and the feasibility and validity of the method is further proved.The frequency combination method is proved to be accurate in deduce,simple in operation and reliable in results,and can be used as an important measure to predict drought. |