In order to solve the problems of redundant values in converting the membership degrees from indexes to objective,this study has developed a new membership degree conversion algorithm of filtration,comparsion and synthesis to evaluate the efficiency on air defense communication system. In the study,the knowledge and space information enbedded in index membership degrees are mined out. Sebsequently,the index distinguish weights are defined and the redundant values,which are useless for classifing index membe...