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In view of failure characteristics of wind turbine gear box, this paper put forward a method for fault diagnosis
based on the ensemble local means decomposition (ELMD) and fuzzy C-means clustering (FCM) method. By resolving
the vibration signal of different fault state of high speed gear box by ELMD, the PF component was obtained with its
singular value, which was composed of known sample followed by a test sample as the feature vector. The known
sample was clustered by using the FCM clustering, and the test sample was recognized and classified . The experimental
results show that the method for fault diagnosis based on ELMD and FCM clustering has good diagnosis results.