An error concealment algorithm based on lagrange interpolation in spatial field and temporal field for H.264 video was presented.Two motion vectors were obtained by interpolating in spatial and temporal field respectively.A hybrid interpolation model was constructed to get the optimal motion vector of lost motion vector by setting up a table for interpolation coefficients and judging with boundary match algorithm.Furthermore

a novel like-interlace method for slices was presented in order to reduce the bad effect of burst error in channel to the interpolation.Simulation results show that this scheme can highly improve the quality of reconstructed video and obtain a gain of about 0.5dB~1dB in PSNR

compared with lagrange interpolation in spatial field in the condition of packet loss rate with 15%.