National Fire Control Symposium (NFCS) is a professional conference in the United States engaged in the research of fire control technology.By introducing the situation of 2021NFCS,it is considered that the newly proposed seven-phase kill chain in NFCS,namely,prepare and configure,surveil, detect,track,identify,engage,access and defend,represents the new thought of American fire control research,and it is considered that the seven-phase kill chain is different from the past six-phase kill chain after preliminary analysis,which includes combat preparation and combat process,gives a more comprehensive description of combat,and emphasizes the preparation and configuration of kill chain.NFCS defines the relationship between kill chain and fire control by giving the requirements of seven-phase kill chain for the successful implementation of distributed integrated fire control.By describing the technical implication of the seven phases of kill chain and making appropriate adjustments to the meeting sessions, NFCS establishes the direct relationship between the combat and the technology studied by NFCS,and promotes the development of fire control technology at the level of fire control research.