In order to improve channel spectral efficiency and the accuracy of amplifyandforward twoway relay channel estimation, a lowcomplexity adaptive channel estimation algorithm is proposed in this paper. Orthogonal Frequency Division Multiplexing (OFDM) modulation technology is used in the twoway relay network. This adaptive filter is realized by constructing array block and combining multichannel twodimensional recursive least squares method. Compared with the traditional twodimensional recursive least squares method, this adaptive filter has lower computational complexity. Based on Matlab platform, the simulation results show that the mean square error performance of proposed algorithm gets improved with higher channel estimation accuracy as compared to the traditional algorithms.