Abstract: Using the flood data from three hydrologic stations in the Yangtze river, the temporal scaling properties of flood volume is studied with scaling theory. The results demonstrate that the variation of annual maximum flood volume with duration has a simple scaling property in a certain period of time. Based on the scaling property, the formula describing the relationship between flood intensity and duration is established. The annual maximum flood volumes are computed by use of this formula. The computed result approximates to the one obtained by the conventional method.