Analysis is made to the superiority of Close-Loop Directed Infrared Countermeasures (CL-DIRCM). The research progress and the experimental verification of foreign airborne CL-DIRCM techniques are summarized and the development trend is given. The working principle and compositions of airborne CL-DIRCM are presented, with focus on the key technologies of airborne CL-DIRCM, including wide-temperature-region, high-efficiency infrared laser technology, high-precision active tracking technology, fast and accurate seeker identification technology, and laser modulated jamming technology with optimized jamming codes. The experimental verifications of the key technologies of CL-DIRCM are given.