Intelligent enabling， multi-dimensional attack and defense， and elastic distributed cooperation have become the important directions of the development of the future attack and defense combat system. Facing the future confrontation of the whole domain three-dimensional attack and defense system， this paper comprehensively analyzes the requirements of future intelligent cross domain elastic defense operations， and puts forward the construction ideas and development stages of the future intelligent cross domain elastic defense system.Furthermore， the key technologies of intelligent cross domain elastic defense system are analyzed to support its construction in the future.