Abstract: Aimed at the restriction of load balance in the combat system simulation with high level architecture (HLA), an extended HLA dynamic balance combat simulation using and adaptive dynamic balance method is proposed. The dynamic load balance problem in the combat simulation is analyzed, and the system structure based on extended HLA is designed. According to the characteristics of combat process, the adaptive comprehensive arithmetic for load balancing and the dynamic sorting arithmetic for data filtering are proposed, with which the system’s load imbalance and network congestion are both reduced. The space confrontation simulation shows that the calculating and exchanging efficiency increase significantly, which demonstrates that the project is effective.