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Flight software testing with virtual target machine may decrease Satellite development costs and increase the product’s quality. During the development of flight software, the processor emulator is an essential tool for software development, verification and the core component of the satellite simulator, which can be substituted for the real hardware. A BM3803 processor simulation method based on optimiezed dynamic instruction translation is proposed, in which, multi queue algorithm is applied to optimize cache elimination strategy. Experimental results show that, after the opitimiztion, the processing speed of the optimized process emulator may reach 260MIPS on average, whichi is 9.6 times of the speed of process emulator provided by QEMU 2.6.1 version. Comparing with the testing speed given by the hardware system, the testing system developed by with the emulator may increase the testing speed by 9 times.