In this paper, the reasons of the active jamming echo formation from the Doppler weather radar, and the morphological characteristics of PPI images from different types of active jamming echoes are analyzed. The concepts of radial energy of reflectivity factor and the firstorder difference of radial energy are put forward, and the azimuth of active disturbance echo is identified by using the firstorder difference of radial energy. Algorithm for the radar data from several cities such as Beijing, Changsha, Shantou, Yueyang is tested. The results show that the algorithm for various forms of active jamming echoes can accurately identify their locations. Especially when multiple locations interference echoes appear at the same time and interference echo coexists with precipitation echo, the algorithm is still able to identify and filter active jamming echo, retaining the whole precipitation echo.