In this paper a definition of distribution width of loads acting on a long narrow bracket in hydropower plant is presented based on the results with FEM,and the definition is validated by two tests of long narrow brackets.Statistical formulas of the distribution width are obtained from the com- putation result.The formulas are simple and convenient to use.The distribution widths obtained by using the formulas are is agreement with experimental data.On the basis,a design method of long nar- row bracks is pre...