In order to identify the potential threat of the next generation fighter to the air defense system， the sixth generation fighter development plans and progress about US， Japan， UK， and French are analyzed. The typical capability characteristics and requires are identified， and the typical operational concepts are analyzed. The typical operational modes are identified initially， and it will provide the reference of the threat drive and development direction traction for the ground-based air defense system.

Integrated air and missile defense battle command system（IBCS）is not only the core system to support the force transformation and operation-concept development of U.S. Air Defense Artillery（ADA）， but also an important platform for deep integration of multi-domain and multi-type air & missile defense combat elements. The base-line version of IBCS began to deliver ADA in 2022. Based on the previous general research， the system component， equipment function， association relationship and troop configuration of IBCS are analyzed. It is pointed out that the new disposition capability of engagement operations center（EOC）is "one-type equipment， multi-level command hierarchy adaptation； one set of software， multi-role and function configuration". Based on the type configuration analysis of EOC， the operational mode and characteristics of IBCS are discussed. The inspiration and suggestion are put forward based on the above research.