Abstract: To remedy such imperfections in multi-level dispatcher training simulator (DTS) as wide cross-domain, communication conflicts among multi-users and multi roles and unable to simulate the instructing process of the dispatcher, a non-player-character (NPC) intelligent simulation method based on BDI Agent was proposed. By means of analyzing the NPC features in the game and integrating it with DTS, a BDI Agent based NPC model was constructed, the behavior tree and sub-behavior tree for dispatcher training simulator was designed and the message event triggering technology was utilized to implement message interaction among multi-NPCs and automatic triggering of grid events. Comparing the proposed method with the process of traditional simulation system, both feasibility and practicality of NPC intelligent simulation technology in multi-level DTS are verified, thus the traditional artificial and unified training mode of dispatchers can be replaced by intelligent and differentiation training mode.