Operational scenarios for civil unmanned systems act as hubs of the industrial value of all-space unmanned system and low-altitude economy, playing a crucial role in scaling up new industries. This typical complex system features dynamic boundaries, multi-level emergence, balanced stakeholder interests, and continuous evolution. Modern systems engineering principles must be used in the design of such systems' architecture to guarantee their safe and effective operation. Our research into the architecture design and modeling of civil unmanned system scenarios produced a "6+6" meta-model, capturing static and dynamic elements. In addition to developing a thorough process that covers everything from element identification to architecture design and modeling, we created a multi-perspective architecture design and modeling including capability, operational, system, and standard architectures. This approach not only provides guidance for the construction of new infrastructure, the research, development, and selection of unmanned systems, and the formulation of policy and standard creation, but also concurrently offers technical support for the establishment of unmanned system operation scenarios and the systematic development of the related industry.