Objective: A radiographic image is a two-dimensional projection of a three-dimensional object.It is often find difficult to help trainees to build this conception before performing radiographic examinations and interpreting radiographic images,because of the complexity of imaging principles,and the scare of radiation during operating radiographic machines.The purpose of this work is to develop an immersive virtual environment to simulate radiographic principles and procedures,so that the trainees are able to learn the radiography without worrying about the radiation danger.Methods: A PC-based Radiography Simulator was developed that rapidly loads the model of a virtual patient,X-ray source and detector.Radiographic images can be produced through digitally reconstructed approach often used to simulate treatment planning system in radiotherapy.The reconstructed images were validated on CT data acquiring from both artificial human body and real patients and evaluated through visual judgment and quantitative assessment.Results: The developed radiography training system is able to produce radiographic images similar to that captured in clinical.Furthermore virtual reality technique allows the trainees to capture radiographs with various degrees of freedom such as projection angles,different combination of KV and mAs,image to source distances and so on.Finally,compared to real x-ray room there is no more radiation danger presenting in the learning place.Conclusions: The new radiography training system has been developed to enable unlimited training exercises safely through the immersive virtual environment.It can be used to consolidate clinical learning scenario because of its flexibility to obtain the radiographs difficult to capture in clinical,it also lends a tool for researchers to investigate the fundamental principle and procedures of radiography.