Abstract: With the development of satellite-based tactical communication networks simulation, simulation system has been a strong demand for automatic management of the running of simulation and the sharing of simulation resources and so on. Aimed at the puzzles in current HLA-based simulation system and with the combination of a new Cloud idea, a framework of Simulation Cloud has been presented. This article is absorbed in the aim how to schedule the task under simulation cloud environment and explore the dynamic dispatch to the parallel tasks in the federation entity level. Finally a mended optimal scheduling algorithm has been designed. This method can optimize network resources and computing resources during static task assignment at the initial application and during dynamic assignment in the simulating process. By extending the cloud computing platform CloudSim to test the Air-Ground warfare simulation system, this algorithm dynamically adjusted decision-making through using the information of systematical real-time operating status. It could make a timely response dynamically according to the changes of the characteristics of simulation system, re-achieve balance and improve the system performance, fault-tolerant and load-balance ability according to the adjustment of the dynamic fluctuations of the loading.