The monitoring station is an important part of the ground segment of satellite navigation system, the received original observation data are sent to the control station through the Internet and satellite communication dual link for ephemeris and clock calculation. In view of the characteristics of long term and stable operation of monitoring station, the implementation strategy of software switch from the perspective of reliability and real-time is described, and the main and standby competition algorithm is put forward, which is applied to the actual operation of monitoring stations after experimental testing.