Adjacent regions are detected in real-time by using panoramic staring electro-optical system,which improves the situation awareness and self-defense of combat platform,and such system has been developed and put into use gradually abroad. The fundamental principle and development background are introduced. Technology features and functions of typical systems are given,and the overall trend is discussed considering the operational requirements. Seeing the urgent needs of practical application,panoramic staring technology should be developed rapidly in order to close the gap between domestic and foreign systems.