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For a semi-supervised classification system,with the increase of the training samples number,the system needs to be continually updated.As the size of samples set is increasing,many unreliable samples will also be increased.In this paper,we use fuzzy c-means (FCM) clustering to take out some samples that are useless,and extract the intersection between the original training set and the cluster after using FCM clustering.The intersection between every class and cluster is reliable samples which we are looking for.The experiment result demonstrates that the superiority of the proposed algorithm is remarkable.