The defense advanced research projects agency （DARPA） seeks to transform from a kill chain to a kill web and intends to construct a highly decentralized kill web to create an unpredictable kill chain through information networks. Under the test flag system， U.S. air force has conducted “orange flag” “emerald flag” and “black flag” tests to promote the application of the kill web concept. Firstly， based on the kill web combat concept， the connotations and differences of the kill web and kill chain are summarized. Secondly， the development background of the “adaptive cross-domain kill webs” program of DARPA is clarified， and its architectural design based on the “supplier-consumer” framework of E-commerce is analyzed. The key technical demonstrations of the program supported by the “anytime reasoning and analysis for kill-web negotiation and instantiation across domains” software are summarized. Thirdly， the key technologies required for kill web are proposed from the aspects of combat management， system architecture， secure communication， infrastructure， and standard specifications. Finally， in view of constructing a resilient kill web for the Chinese military’s defense combat， some suggestions on the construction of a Chinese air defense combat equipment system are given from the technical perspective.

Space military strategies provide the guidelines and foundations for the development of space forces. By sorting and analyzing the contents of U.S. space military strategy in recent years， the trends of the strategies are summarized. The militarization of space is obviously recognized. The U.S. space military strategies show a trend of developing the theory of space active confrontation， transforming into an independent space combat domain， promoting the application of campaigns and tactics， and strengthening the combination with business alliances. Furthermore， the space strategies show significant influences on the development of the U.S. space force， which manifests in improving the actual combat capabilities and accelerating the systematic transformation of space force.The impacts of the U.S. space strategies on the space posture and space activities are concluded， which probably provides references for China’s space force construction and the struggle for space supremacy.