Abstract:scattering line will result in lower contrast and sharpness of the image,but because of the scattered radiation is the inevitable outcome of the radiation interaction with matter, inevitably, it can only control the thus minimizing the impact on the sensitivity. This paper has analyzed the cause of scattering line in digital radiographic testing and the features of scattering line and tits theory of influencing the quality of image quality on digital radiographic testing of GIS equipment have been elaborated, the original X ray detection device is improved, add different filter plates that have been miniaturized and light-weight trended to aim at digital radiographic testing different model of GIS equipment, achieved quick replacement on field test, and the detection process parameters are adjusted to effectively reduce the impact of scattered rays on the digital radiographic testing of GIS equipment.It has been used many times in the actual detection process of GIS equipment, and compared with the filter plate device, the image quality has been improved significantly, and the image resolution and detail performance have been improved to make the image more clear.