The principle and method for precise measurement for arm symmetry of Ramsey cavity of SPJ-1 Lab cesium frequency standard are described in this paper. Preliminary analysis for measuring errors has been made.

• 本文简要地介绍了我们对SPJ-1大铯钟拉姆齐腔二臂对称性精测的原理及方法,对测量误差作了初步的分析,给出了工作的某些结果;