Abstract: The detection of presence of the jamming is the precondition and foundation to counter the Towed Radar Active Decoy (TRAD) and it is an important factor of deciding the effect of ECCM. In order to solve this detection problem, the systemic analysis about the course, format and performance of the TRAD was given, and the angle glint phenomena due to the presence of the TRAD in the radar wave beam were described detailed. Based on the existent conclusion of detection of unresolved targets, the character of the angle glint information when the target and the decoy were both in the wave beam was abstracted. Integrating the specialties of countering the TRAD, the complex angle detection method, the extended angle detection method and the GLRT detection method were formulated in the typical TRAD scene. The simulation according to the TRADjamming scene and different jamming condition were given. The result showed that the presented three detection methods can detect the TRAD correctly on some degree, and the performance and effect of the GLRT method was best during these three methods. The GLRT detection was an effective method to satisfy the requirement of detect the TRAD in practice.