In order to avoid the information loss during the compressed video transmission,an error concealment algorithm based on the diffusion equation is proposed to recover the lost information.In this algorithm,first,a distortion function considering the temporal and spatial boundary matching is presented to estimate the lost motion vectors and make an initial recovery of the lost information.Then,an anisotropy diffusion equation,which is constructed on the basis of activity-masking characteristics in human visual system,is used to make a fine recovery of the lost information.Finally,error concealments for different video sequences in discrete losing and consecutive losing cases are made by simulation.The results show that the proposed algorithm effectively reduces the blocking effect of the recovered images and achieves good visual effect,with a PSNR being averagely 3~5dB higher than that of the traditional algorithm.