The similarity classification of unit embankments can be used for the safety evaluation and management of embankment engineering. On the basis of division of the unit embankments and their attribute indexes are drafted. According to the fuzzy clustering theory, the attribute indexes of the unit embankments are measured by quantitative and qualitative indexes. The fuzzy similarity matrix for the unit embankments is established, and the relevant fuzzy equivalent matrix is calculated by using the square method. By adjusting the threshold of the fuzzy equivalent matrix, the similarity classifications of different unit embankments are obtained, and then the optimal classification number is determined by combining the mixed F statistical method and the fuzzy partition entropy.