The United States and other military powers regard missile weapon system maintenance and support as one of the key contents of annual defense spending， and maintenance and support has become one of the important businesses for foreign military enterprises to expand the military industry chain and ensure enterprises to obtain continuous income. Patriot weapon system is the main combat equipment of U.S. military air defense， and the study of its maintenance and support can reveal the maintenance and support status of U.S. military missile weapon system. The main methods of Patriot weapon system maintenance support and its future development trends of the Patriot missile two-stage maintenance system and Army life extension program are analyzed， which has important reference value for continuously improving the maintenance support level of missile weapons system in our army.