Compared with other large-scale warfare simulation systems, wargame, as a traditional type of warfare simulations, has the advantages of low cost, convenience, practicability, etc. In order to realize Human-Computer Confrontation, Computer Generated Forces (CGF) technology has been added to wargame, which would enhance wargame's training and decision support ability. Based on computerization of “Future: Korea War” which is a strategic-level wargame, this paper presents a framework of wargame CGF system based on multi-agent and defines its Atomic Action Library. The framework and the Atomic Action Library provide the basic platform for farther research on the intelligent behaviors of each agent in wargame CGF system.