Abstract: A condition-assessment-based maintenance strategy of T/R module is presented for the large number and frequent malfunctions of phased array radar T/R module and the fault type related to a variety of detection parameters. The synthetic and independent status parameters are established according to the association rule of each test data. In view of the fact that the constant weight coefficient can’t reflect the actual working status of T/R module accurately, a balanced function is introduced to calculate the variable weight coefficient of synthetic status parameters, an objective and accurate status assessment method of phased array radar T/R module is established, and the maintenance threshold of T/R module is determined by the tactical index of phased array radar. The proposed method is used to evaluate the fault T/R modules which are detected by built in test(BIT)，and the fault T/R modules which score is less than 60 points are replaced with the new T/R modules. The calculated results show that the assessment method and maintenance strategy have high feasibility， and make full use of the surplus value of T/R module， which are of great importance to improve the support effectiveness of equipment.Key

Key words: T/Rmodule, conditionassessment, maintenancestrategy, associationrule, variableweightcoefficient, syntheticstatusparameter, independentstatusparameter