Regarding the large amount of samples,random truncation and multiple data sources of the outfield use & support data in airborne electronic countermeasure system,a method for continuous evaluation of electronic countermeasure system reliability based on outfield use and support data is proposed.Firstly,the steps of continuous evaluation of the reliabilty of the airborne electronic countermeasure system is analyzed.Secondly,the collection,analysis and verification methods of outfield use and support are given.Then,the equipment-level and system-level reliability evaluation models based on use and support data are constructed.Finally,the correctness of the proposed method is verified via an case analysis of a certain type of electronic countermeasure system.