Cesium atomic clock is the key equipment to establish and maintain a high-precision time system in Loran-C system. Its performance directly affects the accuracy and stability of the established system. This paper introduces the interface comparison between 10890a cesium beam tube of 5071a and 4510a cesium beam tube of 4510a magnetic separation atomic clock in the United States, and analyzes the working principle, technical characteristics, main technical indexes and test results.