In OFDM system, the ICI between the carriers has a serious influence to the channel equalization. On the other hand, considering the MMSE channel equalization algorithm, the equalization MSE results are not stable in different channel models. A robust MMSE channel equalization algorithm is presented in this paper, with the core is that normalizing the PDP of different type of channels, then the MMSE algorithm could get a stable and robust performance in different type of channels.