本文扼要叙述了双频激光技术在三座标测量机上的应用，介绍了其测量原理及其特点；研制了一路分成三路光的偏振折光镜；讨论了本系统的误差对单轴座标精度的影响；最后指出存在的问题及改进途径。 This article briefly describes the application of dual-frequency laser technology on a three-coordinate measuring machine, introduces its measuring principle and its characteristics, and develops a polarizing refraction mirror which is divided into three channels of light. The error of the system is analyzed to the uniaxial coordinate accuracy Finally, it points out the existing problems and ways to improve them.