In order to reduce the influence of the surface hole position on the safety performance of arch dam and avoid the deformation of the radial gate supporting structure,the influence of the surface hole position on the stress of the radial gate supporting structure is studied.Selecting the basic parameters of the radial gate supporting structure,given the dynamic data of the dam mechanical performance modeling calculation,the stress of the arch dam radial gate supporting structure during the overflow process of the surface hole is calculated,the horizontal or vertical coordinates of the surface hole under different conditions are set,and the stress change is calculated according to the relative distance between the surface hole position and the origin coordinate,and the influence of the distance between the horizontal and vertical position of the surface hole and the origin coordinate is analyzed the influence of stress on the door supporting structure.According to the calculation data,it can be seen that：when calculating the positive azimuth stress of radial gate supporting structure,both the maximum value and the minimum value show an increasing trend.When the distance between the surface hole position and the coordinate origin is less than 10m,the effect on the stress of radial gate supporting structure is slight,only 0.1-0.4 MPa growth,but when the distance between the surface hole position and the coordinate origin is more than 10m,the growth rate will be greatly improved.Concerning the calculation of reverse azimuth stress of radial gate supporting structure,the maximum stress will increase continuously with a small and balanced growth range,while the minimum stress will show a decreasing trend,followed by an increasing trend.