Abstract: The rapid development of aerospace technology promotes the intensification of the militarization of space. The advantage of unique orbital resource advantage of high earth orbit makes it a strategic location for space games between major powers. The typical space security satellites are comprehensively investigated, which are deployed by the U.S. military in high earth orbits. Future, the execution capabilities of these missions are analyzed from the aspects of high earth orbit situational awareness and attack and defense capabilities, and the U.S. military’s high earth orbit space security application capabilities and related key technologies are reviewed and summarized. Finally, relevant suggestions are given for the construction and development of China's high earth orbit space security system.

Key words: high earth orbit;space security, situational awareness, space attack and defense