本文利用激光实时全息干涉技术 ,测量了甘氨酸水溶液的扩散系数。首先测定了 2 98.15K下蔗糖水溶液的扩散系数 ,取得了较好的结果 (总相对误差为 0 .84 % ) ,证明了装置的准确性。进而用该装置对不同浓度下的甘氨酸水溶液进行测定 ,得到了不同浓度甘氨酸水溶液在不同位置的扩散系数及每一浓度下的平均扩散系数 ,并对结果进行了分析和讨论 In this paper, the diffusion coefficient of glycine aqueous solution was measured by laser real-time holographic interferometry. First, the diffusion coefficient of sucrose aqueous solution at 2 98.15K was measured and good results (total relative error 0.84%) were obtained, which proves the accuracy of the device. Furthermore, the device was used to measure the glycine aqueous solution at different concentrations, and the diffusion coefficients of different concentrations of glycine aqueous solution at different positions and the average diffusion coefficients at each concentration were obtained. The results were analyzed and discussed