This paper used the Empirical Mode Decomposition (EMD) ,solving the problem of the modulation type recognition of Orthogonal Frequency Division Multiplexing (OFDM) on blind signal Processing of communication .This method uses the characteristics of the OFDM' envelope nearly Gaussian .Using the EMD decomposition algorithm of signal decomposition, extract the intrinsic mode function (IMF) after signal decomposition and computes the correlation co-efficient of IMF and the original signal as the recognition feature .So as to achieve that identification the OFDM signals and single carrier linearly digitally modulated (SCLD) signals (MFSK(2FSK, 4FSK), MPSK(BPSK, QPSK)) without prior knowledge. Experiments show that this method has a good performance with less computation, and this method also has well Real-time and robustness compare with the methods of the wavelet transform and the higher order cumulants.