The paper, from the angle of conformational analysis, explains the experimental result of the reaction of pinacol rearrangements of cyclohexan_diol reasonably, which is caused by the cis and trans isomer of 1,2-dimethyl cyclohexan_diol. 本文从构象分析角度合理解释了1,2二甲基1,2环已二醇顺、反异构体发生Pinacol重排反应的实验结果。