An overview was given to the development of fly-by-light (FBL) control system. The achievements in every period of the international research work about FBL were illustrated. The key problem that restrict the development of FBL was the FBL hardware. The way how to select optical components which were suitable for aviation environment was discussed. Considering the present status of technology and the level of researches on FBL in our country, the research steps and direction of FBL were provided.