Aimed at the abominable influences to blind equalization algorithms caused by complex timespace variability existing in underwater acoustic channels, a new selfadjusting decision feedback equalization(DFE) algorithm adapting to different underwater acoustic channel environments is proposed by changing its central tap position. Besides, this new algorithm behaves faster convergence speed based on the analysis of equalizers’ working rules, which is more suitable to implement communications in different unknown channels. Corresponding results and conclusions are validated by simulations and spot experiments. Aimed at the abominable influences to blind equalization algorithms caused by complex timespace variability existing in underwater acoustic channels, a new selfadjusting decision feedback equalization (DFE) algorithm adapting to different underwater acoustic channel environments is proposed by changing its central tap position. algorithm behaves faster convergence speed based on the analysis of equalizers’ working rules, which is more suitable to implement communications in different unknown channels. Corresponding results and conclusions are validated by simulations and spot experiments.