本文提出测量单模波导参数的新方法.用棱镜耦合器测量两种偏振基导模和基漏模的模折射率,并由相应的四个模方程确定单模波导参数.其测量精度优于纯导模测量.用这种方法测量了单模玻璃波导参数,并对误差来源作了理论分析. In this paper, a new method of measuring the parameters of single-mode waveguide is proposed.The mode-refraction index of two kinds of polarization-mode guided-mode and the basic mode is measured by prism coupler and the parameters of single-mode waveguide are determined by the corresponding four mode equations.The measurement accuracy is better than Pure guided-mode measurement. Single-mode glass waveguide parameters were measured by this method, and the theoretical analysis of the error sources was made.