The invention relates to an evaluating method of motion vector of a damaged macro block in time domain error concealment. The method reevaluates the motion vector of a neighboring macro block above orbelow the error micro block to replace the motion vector of the currently damaged micro block so as to carry out time domain error concealment; while the method of template convolution is adopted toevaluate the motion vector; the region of the current micro block is selected as a matched template; and sliding convolution is executed to the micro block by a front frame to evaluate the maximum value of the convolution so as to select the best matching region of the template in the front frame. Compared with the prior art, the evaluating method of motion vector of a damaged macro block in timedomain error concealment has the advantages of accurate evaluation on the motion vector and ideal concealment effect to the images moving more strenuously.