“Demand traction and technology promotion” is the main law of equipment system construction and development.Focusing on the relationship among capability requirement,equipment construction and technology development,the basic framework of technology system demonstration and are put forward and analyzed based on capability space and capability gap,and the basic method and process of argument analysis of technical system,including the existing capability analysis,target capability analysis,capability gap evaluation,capability-equipment-technology mapping,technology architecture view model construction,etc.are put forward.By analyzing the capability gap of equipment system,the corresponding equipment technical architecture is constructed,which provides a reference method flow for argument analysis of equipment technical system.