The consistency between H and V channels of polarimetric radar is the key technology for polarimetric upgrades to the operational new generation weather radar in China. The paper uses external instrument and internal test signals to analyze some key performance indicators, including dynamic range, noise coefficient, echo intensity calibration and consistency between the two channels of receivers. All these performance indicators show proper variance and meet the design requirement, while there are differences in the test results of polarimetric parameters, e.g., 〖WTBX〗Z〖WTBZ〗DR and 〖WTBX〗φ〖WTBZ〗DP. Regular inspection and correction are needed to ensure the consistency of two channels. But it is found that the amplitude and phase differences of H and V channels changed regularly with the varying azimuth. The effect of azimuth rotary joint should be taken into consideration in long term operation according to the results.