Abstract: In group decision making model based on linguistic information，because of the uncertainty of natural language，it is needed to find the linguistic term sets which are used to express the information.In the sets，the meaning of linguistic term is uniquely confirmed through the difference from others.A series of nature linguistic term sets are used in an evaluation model.In the approach of aggregating the linguistic term in different sets，it is necessary to redescribe linguistic terms using a group of standard linguistic terms.In the redescribing course，if the dissimilarity measurements are kept，the information uniformization course will hold on the meaning of linguistic terms.In many articles，the cardinality of the set of standard linguistic terms is set from 7 to 13，but other material rules which used to choose those important linguistic terms in evaluation system are not provided.In order to decrease the difference of linguistic term in the uniformation course，the conception of the applicability measurement of standard linguistic terms set is given.