Abstract: The system-generated electromagnetism pulse(SGEMP) response is (researched) for column model in metal cavity by X-ray, and the amplitude, waveform and distribution of electromagnetic pulse are given. The result shows that electric field nearby the surface of metal shell and column model with X-ray in system at the fluence of (8.4 J/cm~2) is as high as 10~6 V/m, and there is quite harmful to system parts. It is necessary to take reinforce step.