Abstract: As the development of information technology, SAR is used in military, geography and nature disaster monitoring The requirements for the real-time display and the resolution of the imaging ability of SAR are higher and higher Therefore, the urgent problem is to do the research of real-time systems, which has its own knowledge property and can support the real-time imaging of high resolution To solve the problems of real-time data receiving, store, display and process, a scheme of real-time system is proposed Combined with a kind of real-time extending technique of Linux kernel which is in the operating system level, this scheme implement a real-time scheduling approach which can have high processor utilization and can support the hybrid scheduling Function modules are implemented in the application level They can satisfy the time constraints The real-time drivers for DSP are also designed Therefore, a whole system including levels of hardware driver, operating system, and application software is established