An optical bleach system was designed to deal with a puzzle where one of OSL intensity in Al2O3:C indicating two different amounts of doses. After the optical bleach, a different OSL decay speed was discovered to separate those two doses. This research helps in the emergency management of nuclear accident or high radiation exposure event. Experimentally, visible light and ultraviolet light was used as the bleach light source. UV was discovered with anti-bleach property. Therefore, a flexible UV thin film filter was set in the visible light bleach system. Furthermore, a dynamic band theorem simulation was used to describe electron property inside the Al2O3:C. Optical bleach simulation and maximum bleach simulation match the experimental data successfully. The model can not only predict the optical bleach effect but also the OSL signal variance by changing excitation photon energy.