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Similarity measure among ship maintenance cost cases plays an important role in cost forecasting. A combined fuzzy clustering algorithm which integrates fuzzy transitive closure method and fuzzy c-means method is proposed to deal with this problem. In order to improve the performance of the combined algorithm, a weighted cosine distance method is also put forward to establish a more reasonable fuzzy similar matrix. The experiments show that the proposed fuzzy clustering algorithm can greatly improve the quality of case retrieval. The application of the combined algorithm is feasible and effective.