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The paper introduced grey comprehensive relational grade into transverse analysis and compare for several similar communication equipments. By analyze the grey relational principle, the relational coefficient, the selection of the distinguishing coefficient and studying several relational grades, the grey comprehensive relational grade is successfully applied to analysis of communication equipment fighting efficiency. Results of the practical application show that the method based on the comprehensive grey relational grade analysis has the advantages of simplified computation and feasible, consistency to the qualitative analysis result, It can provides theoretical guidance for targeted maintenance of the equipment and improve and increase rapidly fighting efficiency of airborne early communication system in war.