Abstract: In the study of pulsed X-ray radiation effect, it is necessary to integrate the information of time dimension into the simulation model, and then realize the numerical simulation of radiation effect based on time energy joint method, which provides a research idea for the simulation of transient pulsed radiation effect. The model of bremsstrahlung shooting is established, and the energy spectrum of outgoing pulsed X-ray is calculated. Combined with the radiation effect simulation model of radiation object, the energy deposition of alumina ceramic sample at different time and different incident depth was obtained.