From May 2013 to May 2014， the networked radar system consisting of 4 Xband weather radar in Nanjing and the surrounding areas was installed for rapid alert and fine detection of thunderstorms and heavy rainfall under the cooperation of IAPLAEGO and CETCNRT. The developing key techniques of cooperative selfadaption observation by single and multipleradar are discussed. The cooperative selfadaptation observation frame is established, and the software of the core observation control algorithm is developed. The main algorithm includes weather area selection and scan strategy. The intelligent judgment and highlight of severe weather areas are realized, and relative positions between radar and the target are also taken into consideration. The results show that the developed mode for cooperative selfadaptation observation, which could accurately find the weather areas of interest quickly, is effective. The higher spatial and temporal observations of important target areas have been acquired.