A new method that combining digital light field photography technology with the XRay scintillator imaging system is proposed. The scintillation luminescence principle and light intensity distribution are analyzed, a XRay light field imaging system is designed based on camera arrays, and the scintillation luminescence model is simulated. Camera arrays in 3ds Max is used to capture the light from scintillator and get the images from different viewpoints. The light field data is generated that is similar to the data from microlens based system and get the images of arbitrary planes in the scintillator using the digital refocus algorithm. The simulation experiments show that XRay imaging system without using light field photography has a small depth of field; only a part of the scintillators are focused by optics and the defocused rest will decrease the image resolution; on the contrary, system with light field photography can extend the depth of field of the optical system to reduce the requirement of the scintillator thickness without changing the basic structure of the optical system; it can also get the image of the same resolution. The simulation provides theoretical basis for the establishment of real model.