The comprehensive evaluation of enterprise logistics system is an important method to assess and improve the operation effect of logistics system.To converse membership degrees from indexes to objective is the core step in fuzzy comprehensive evaluation of logistics system.However,existing converse algorithms are questionable because redundant data which are useless to objective classification are involved in calculation of membership degrees of the objective.Therefore,in order to classify objects properly,index distinguishable weight,effective value and comparable value of index relative to samples are defined;A membership transformation method based on "filtering,comparison and composition" from single-index measure to multi-index comprehensive measure is also proposed to converse membership degrees without no redundancy date,which can be used in comprehensive evaluation on logistics system.