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Asymmetric stereoscopic coding can save bitrate and maintain the overall visual quality of stereoscopic perception, so it is an alternative for wireless environment in which the bandwidth is limited. In asymmetric stereoscopic coding, the right-view images are down-sampled to half resolution before coding, while the direction of sampling influences the rate-distortion performance of the asymmetric stereoscopic coding. In this paper, a new scheme to prejudge the down-sampling direction for the asymmetric stereoscopic coding is proposed. The sum of absolute transformed difference(SATD) of 16×16 macroblocks intra-predicated vertically and horizontally in the left-view image are calculated so as to judge the relativities in vertical and horizontal directions. Finally, the direction with higher relativity is chosen as the down-sampling direction for right-view images. The experimental results show that the proposed scheme can prejudge the sampling direction correctly.