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Air platform is the key equipment that affects the victory or defeat of modern war. In the high antagonistic environment of the future air combat, the "hard kill" active defense system becomes the key factor improving the survivability of air platforms. In order to study the key problems on the construction of air platform active defense system, the development status and current situation of foreign active defense system and equipments of air platforms are analyzed. According to the characteristics and operational requirements of the air platform active defense system, which must have all-direction situation awareness and attack capability, and achieve high-precision guidance and head-on interception under the fast rendezvous conditions, the key technologies of the air platform active defense system, such as high precision early warning, detection and tracking technology, all-direction attack technology, counter-parallel interception and guidance technology, interception and damage technology, and lightweight defense missile technology, are compared and analyzed. These studies can provide technical support for the research on active defense system and weapon equipment of air platform.