Time frequency system is one of the important parts of satellite navigation system ,domestic and international satellite navigation systems are using atomic clocks group as frequency source .The article introduces synchronization and control methods of frequency source of domestic satellite navigation system .Frequency source of domestic navigation sys‐tem adopt redundancy design by using domestic atomic clocks and the main case atomic clocks .Using synchronous control method to phase the synchronization control and using frequency control method to phase the frequency control .But two problems exist ,it will oc‐cur phase hopping when switching between the main clock and the standby clock ,and atomic frequency hopping is not easy to be identified ,the article brings forword ways to solve the problems .There are some engineering significance to improve the stability and accuracy of the entire time frequency system .%时间频率系统是卫星导航系统的重要组成部分，国内外的卫星导航系统均采用原子钟组作为频率源。介绍了国内导航系统频率源的同步与控制方案，采用国产原子钟和主备原子钟的冗余设计，分别利用相位同步控制法和频率同步控制法进行相位同步控制和频率同步控制。对方案中存在的两个问题，主备钟切换时相位跳变和原子钟跳频时不易被发现，提出了解决方法。对提高导航频率源的稳定度和准确度，有一定的工程指导意义。
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