Multiple key factors affect the accuracy of weather radar reflectivity factor measurement. Among them, radar transmission power is the key variable that is most prone to fluctuation in radar performance parameters, affecting the accuracy of radar measurement. The dynamic range of the receiver is a key indicator for measuring the stability of the receiving channel, and directly impacts the measurement results of reflectivity factor. An excellent weather radar system should have functions such as online monitoring, calibration and correction of key performance parameters. This paper statistically analyzes data samples collected over the years 2020-2024 from 12 networked CINRAD/SA-D radars in Guangdong, and tests the effectiveness of CINRAD/SA-D radar reflectivity factor calibration and online correction. The necessity of offline calibration of networked radar is demonstrated through the comparison and stability analysis of key performance parameters. Additionally, the first volume scan data collected when the radar is powered on can easily have quality problems, which should be paid attention to in radar maintenance and data application. So, we recommend that the mechanism and flow of this kind of weather radar reflectivity factor calibration be used for the phased array weather radars.