Using mean daily discharge data from 1980 to 2015, effects of the Three Gorges Dam on hydrological situation of the Three Outlets were measured based on indicators of hydrologic alteration. Except for a slight increase in Xinjiangkou station and Mituoshi station from January to March, mean monthly flow showed a significant downward trend in the five hydrological stations of Three Outlets, and decreased more in flood season. The maximum daily flow showed an significant downward trend for all hydrological stations in the past decades, but the trend was relatively stable after 2003. Number of day...