Abnormal echoes because of transmitter, receiver, and servo fault were analyzed in this article. Affection to archive data and the alarm of different fault were analyzed also. The result shows that constructing radar status information database, inspecting radar status information of archive, and forming abnormal data block including archive， status, and alarm can improve data quality, supply credibility information for users. According to statistics of Shijiazhuang radar site, 90% abnormal radar data can be eliminated. These supply reference for radar data quality control, fault diagnosing, and sounding technology improvement.