Abstract: As aerological sounding has strict requirements on time, maintenance of L band radar must be as fast as possible. Repairing quickly enough depends on methods well enough. This paper presents a method to repair L- Band Radar fault fast: Based on static and dynamic parameters of GFE (L) 1 Band Wind- find Radar, contrast analysis and signal correlation method can be used to repair radar's fault quickly enough. Practice has proved that according the change of radar static and dynamic parameters, combining with the principle block diagram, the thorough analysis of the static and dynamic job characteristics, this method can make faults judging " precise, steady, fast", achieving quick and perfect repairing.