Empirical Mode Decomposition (EMD) is kind of adaptive decomposition method and it is mainly applied to nonlinear and non-stationary signals. Ensemble Empirical Mode Decomposition (EEMD) method was raised to solve the issue of mixed mode in the traditional Empirical Mode Decomposition. This paper mainly discussed the different effects of EMD and EEMD to the noisy signal. It talked about some problems in applications of EMD and EEMD through particular examples.