Abstract: A low complexity spatial-domain error concealment method is proposed to reconstruct lost Macroblocks（MBs） that content edges in video when they are transmitted through unreliable channels.The proposed concealment algorithm uses gradient data to estimate edge-orientation in the lost MB；Then each pixel is directionally interpolated from boundary adjacent pixels using a new method.Experimental results show that the proposed algorithm can recover high as well as low frequency information in lost MBs and provide better quality and speed in comparison with the conventional spatial domain interpolation.