Regenerative cooling has been playing an important role on scramjets for safe sustained-operation [10]. However, fuel coolant can only cool the scramjet components such as combustion chamber, and the high temperature and heat flux of the scramjet wall have not been effectively utilized in a conventional thermal conversion way to produce electricity. There once existed a new Re-cooling Cycle which contained a turbine to transfer enthalpy from fuel to mechanical work and electric power [11,12]. However, only part of fuel heat is converted to mechanical power [13,14]. In general, the electrical efficiency of Re-cooling Cycle is relatively low.Energy recovery has been a hot issue in all kinds of engines in recent years. In the case of waste heat recovery the ORC is a device for directly converting thermal energy into electrical energy [15]. As a possible alternative to the effective use of limited resources to reduce the fuel flow for cooling, an ORC power generation system for cooling scramjet based on the thermodynamic principle is performed. ORC has been used in many fields for energy recovery [16][17][18]. Önder [19] has proposed an organic Rankine for