Abstract:We advance an analytical method of CORS height time series based on K-means clustering EEMD. Aiming at the problem of low signal-to-noise ratio and partial mode mixing in signal decomposition of traditional EEMD, we add positive and negative white noise EEMD to improve signal decomposition SNR. Based on the K-means clustering method, we cluster the various IMF components decomposed in the EEMD iterative process. The experience results show that the method improves the SNR by more than 3%, and the decomposition accuracy based on index of orthogonality increases by more than 26%. The clustering results can solve the problem of mode mixing of the approximate year, half-year and two years periodic signals in the IMF.