Abstract: In order to analyze the variability of coordination of flood process, the Flood Process Synergy Degree Evaluation model has been established in the paper. The example is shown by the 53 floods in the Lishi station of Wujiang River . The order parameters of the flood process, including 17 flood volumes, are formed by the flood freshet and stage of flood process, respectively. The results show that the synergy of four floods (in the years of 1968, 1994, 2002, 2006) from a point of synergy degree, which brought greater economic losses. did not display variation in Wujiang River basin. The performance of buffer and coordination, which appears in freshet stage and recession stage, is not strong in each flood process in Wujiang River Basin. At the same time, there were the great variations of synergy, which occurred in 1963 and 1991.