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To benefit network transmission, the bit stream of the whole frame coded by H.264 is usually grouped into a single packet. However, the error and packet loss during the transmission will result in the distortion of reconstructed video. To deal with this problem, error concealment is widely used to recover the lost frames and to prevent error propagation. In this paper, we propose an accurate motion vector refinement algorithm to further refine the well-known motion copy error concealment method and thus improve the concealed results. By using the motion vector correlation from spatial and temporal domains, a possible motion vector difference variation area has been discovered by the recursive motion vector difference examining approach in the previous frame. Afterwards, a more precise motion vector difference can be derived from the selected motion vector difference variation area. Through the help of our proposed algorithm, the refined motion vectors can be obtained and thus improve the accuracy of motion vectors derived by a motion copy error concealment algorithm. Simulation results show that our proposed algorithm can achieve better performance compared to well-known schemes.