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With a series of advantages such as small size, short development cycle, low development, and launch cost, and network operation, micro-nano satellites have been rapidly developed in the fields of communication, remote sensing, and navigation, etc. Single micro-nano-satellites are relatively simple in function and weak in capability, so they mostly work in the way of swarms. How to combine satellite development, capability formation, and other multi-consideration perspectives to form a micro-nano swarm system construction is particularly important. The paper proposes a technique for building a navigation micro-nano swarm system from the perspectives of the satellite development cycle, launch response time, capability formation time,and optimizes the designed swarm at the methodological level from the perspective of comprehensive mission effectiveness satisfaction. The system construction can provide long-term continuous navigation service and effective emergency enhanced navigation service for the designated area.