The extreme abnormal climate appeared in the Yanhe River Basin in July 2013, with incessant heavy rains occurring for 20 days over the basin, which lead to continuous floods at the Ganguyi hydrology station. Based on the processed data from the station, the floods were divided, the runoff coefficient and antecedent effecting rainfall were calculated, and the difference between “7.12” and “7.25” floods were compared. The calculation and investigation show that the rainfall intensity and antecedet effecting rainfall are the major and minor factors of the two typical floods.