In view of the influence of autonomous technology of unmanned system on the development direction of future warfare, the research status and development trend of autonomous technology of unmanned system are analyzed. The autonomy of unmanned system is elaborated, and the framework of autonomous technology of unmanned system is introduced by taking different single navigation tasks as an example, focusing on the role of internal and external drives in environment model construction and behavior decision-making; The research status of autonomous technology of unmanned system is analyzed, including situation awareness, automatic planning, policy learning and environment model learning.Based on this, the research trend of autonomous technology of unmanned system is determined. The problems and challenges in the practical application of the technology are discussed. The results show that the analysis can provide reference for the development of unmanned system in China.