The electrical generation, hydraulic power and pneumatic power of an aircraft is supplied by the secondary power system or the power extracted from engines by the secondary power system. After the mode transition of TBCC, there is no energy from engines for extracting. Therefore, it is needed to solve the problem of long time and high energy output of the secondary power system for airspace hypersonic aircraft. The technical features, application and development of the secondary power system is concluded in this paper, as well as the development of hypersonic aircraft. The combination of ATS & RAT and superconducting generator of more electric engine technology & large energy storage devices are available technical routes for integrated energy of airspace hypersonic aircraft .