Xiangjiaba hydropower station in Jinsha river has stored to normal level,but its shipping parameters is still a big controversy.To protect the upper Yangtze River’s main basic maintenance dimensions,we carry out a research on the minimum discharge of Xiangjiaba hydropower station in Jinsha river by the guaranteed frequency method,reverse flow method about waterway maintenance scale,natural inflow ratio with the score distribution method,etc. The result shows that the natural inflow ratio with the score distribution method is more suitable for hydropower station in branch streams,and the minimum discharge of Xiangjiaba hydropower station should not be less than 1 296 m3/ s.