Abstract: Focusing on the multi-agent system of LLMs in closed C2 links, the key technical issues of LLM multi-agents in C2 links is aimed to be explored , and a multi-loop nested LLM multi-agent C2 model is pro-posed, a solid theoretical and technical foundation for breaking through unmanned C2 and autonomous colla-boration is laid. In full consideration of the question-and-answer interaction mode of LLMs, a P（R）EA&OODA multi-loop nested LLM multi-agent C2 process model is proposed. Taking the system prompt as the core entry point, a framework for LLMC2 agents is proposed. Two types of "personified" LLM agents of commanders and operators are designed. A text-based C2 simulation task "pursuit game" based on a physics engine is designed and implemented to verify the effectiveness of the model, and the system is evaluated and analyzed from multiple dimensions.