The reflectivity quality control algorithm in SWAN is described, including data preprocessing,isolating noise echo filtering, and AP echo suppression. Data preprocessing converts raw radar data to RD20 format and checks data quality. Isolating noise echo filtering includes bi directional searching and echo feature filtering. AP echo suppression uses the fuzzy logic method.The parameters of the algorithm are described. As the probability distributions of AP features from Wuhan, Suizhou, Xian radar are similar, it is concluded that the default parameters can be applied in more than one radar site.The evaluation of the algorithm shows that the most AP echoes can be suppressed; meanwhile some AP far away from radar cannot be suppressed; and some rainfall echoes are wrongly identified as AP.