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In this paper, a BMK telemetering multiplexer, which can be controlled by both programming and manual, is developed to meet the demand of a few flight control subassemblies being tested in the same temperature gradient. The multiplexer consists of FPGA, selected channel address buffer, BMK receive module, BMK transmitting module, indicating circuit, clock circuit and so on. Owing to the FPGA module, the multiplexer functions flexibly and has brief structure. Furthermore, signals of each channel are adjustable and delayed, which increases transmission accuracy of BMK telemetering data. Different data has been transmitted through five channels to test the stability of data selector and results are correct. On the whole, experiments prove that the multiplexor functions stably. Besides, it cuts down testing time, therefore improve the testing efficiency. 