Space radiation can cause radiation damage or even failure to spacecraft, which is a threat to the life, health and safety of astronauts. With the development of space activities, higher requirements are put forward for the development of space radiation detection technology. A total dose detector is designed and developed by radiation-sensitive field-effect transistor(RADFET) detection technology. In this paper, the design principle of the detector and the analysis of test data are introduced, as well as the research and development direction and the prospect of space application.