In this study, we evaluate the detection sensitivity， ground clutter suppression performance and the quality of polarimetric parameters, including differential reflectivity (ZDR), differential phase shift (〖WTBX〗Φ〖WTBZ〗DP), specific differential phase (KDP) and correlation coefficient, based on the Sband Dualpolarimetric radar of Guangzhou. The results show that the detection sensitivity retain the fine qualities and the effect of ground clutter suppression has been greatly improved after the upgrading; 〖WTBX〗Z〖WTBZ〗DR has a stable systematic bias not exceeding 0.2 dB, increasing with 〖WTBX〗Z〖WTBZ〗 in agreement with to the empirical value. The initial phase of〖WTBX〗 Φ〖WTBZ〗DP  shows good stability, and 〖WTBX〗K〖WTBZ〗DP  is sensitive to precipitation, especially corresponding well to heavy rainfall. Correlation coefficient can be used to divide successfully meteorological and nonmeteorological targets.