This paper systematically analyzes the cylindrical gear reducer design often used for theodolite antenna pedestal with high dynamic demand in a large radar antenna and some common questions and their causes. 综合分析了大型雷达天线设备中,动态要求较高的经纬式天线座常用的圆柱齿轮减速箱的设计,以及易发生的一些问题和原因。