The invention relates to a nuclear security Table Top Tool system. The system comprises a scheme module, an animation module, a role and equipment module, an information module and a map module, wherein the scheme module is connected with the animation module, the role and equipment module, the information module and the map module, the animation module is connected with the role and equipment module, the information module and the map module, the role and equipment module and the information module are both connected with the map module, and the role and equipment module and the information module are connected. According to the nuclear security Table Top Tool system and a use method, a sand table is virtualized into a complete 3D model with a virtual reality technology, accordingly, various complex operational environments are created, various operational command schemes are simulated, besides, the system can be saved in real time and called at any time, the system can be demonstrated on various display equipment, the use occasion can be enlarged, the participation number of people can be increased, and the purposes of high efficiency, directness and practicability are realized.