Through analyzing the characteristics of the human visual system and the existing algorithms of stereo image or video quality assessment,an objective quality evaluation method of stereo video based on motion and disparity information is proposed in this paper.The stereo video is assessed from the two aspects of video quality an d stereo sense.We follow the method of gradient-based structural similarity (GSSIM) and give full consideration to the effects of the intra-frames luminance a nd structure information, the inter-frames motion information as well as the characteristics of the human visual system on the quality of stereo video,when dealing with objective quality assessment of the st ereo video.Especially,we give different weights to the quality of left and right view,according to the ch aracteristics of the human visual system.In addition,we compute the peak signal-to-noise ratio (PSNR) bet ween the absolute disparity maps of original video sequence and distorted video sequence when assessi ng the stereo sense of the stereo video.Experiment results demonstrate that the objective assessmen t method presented in this paper gets similar results with the general subjective assessment method an d is related to the human visual system when assessing the encoded stere o video based on H.264.