Channel　estimation　for　orthogonal　frequency　division　multiplexing　(OFDM)　system　has　attracted　widespread　attention.　In　this　paper,　a　novel　efficient　two-dimensional　(2-D)　channel　estimation　algorithm　based　on　fast　Fourier　transform　(FFT)　is　proposed　for　a　time-variant,　frequency-selective　wideband　wireless　channel.　Both　theoretical　analysis　and　simulation　results　are　addressed　in　the　paper.　The　simulation　results　prove　that　the　proposed　algorithm　has　simpler　implementation,　better　performance　and　wider　application　than　other　traditional　decision-directed　algorithms.