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Combining cloud computing and mobile computing, a frame of Operational Command Training Simulation System based on mobile cloud computing was proposed, which includes infrastructure, platform, support, application and middleware layer. And the detail design of middleware layer was described. Some key technologies of the layer were settled as: cloud service access adapter, cache management and consistency maintenance strategy, data blocking and parallel processing. The bottleneck of the mobile terminal with limited resources had been solved, and the distribution and interoperability of simulation systems were enhanced.