Abstract: The construction of fuzzy similar matrix is not only the fundamental but also the most important work in fuzzy cluster's analysis.There are thirteen kinds of methods in the construction of the fuzzy similar matrix，which were put forward by many scholars for a long time.Without any standard for method choosing,people always choose their favorite methods,so there is some problems，such as whether those methods have the same cluster’s result,which method is the best if the results are different.In order to answer those questions,three principles about  how to choose the method of the construction of the fuzzy similar matrix are put forward in this paper,and then a complete comparison among all the construction methods is made，at last the best method used in the construction of the fuzzy similar matrix meeting the three principles is recommended.

Key words: fuzzy cluster's analysis；fuzzy similar matrix, whole resolution, cluster resolution