Abstract:Huge volume and terrible stability are the characteristic features of power supply system (PSS). An universally modularized method has been put forward to work out the trouble based on foundationally Modularization. PSS has been divided to several modules such as power relay module, signal relay module, PXI control module, ground cable module, software module etc. By universally modularized design and combination of software and hardware, miniaturization size, integration degree, robustness and universality between different aircrafts PSS are all enhanced and reinforced.