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In the field of comprehensive test and diagnosis, with the improvement of the complexity of the tested system, the accuracy of the test system is required to be further improved. In this paper, a combination of microwave accessories is designed and implemented, which is mainly composed of microwave switch, attenuator, power amplifier and power supply. The equipment has achieved various technical requirements, among which the standing wave ratio of microwave switch is not more than 1.3 at dc-1ghz and 1.5 at 1ghz-18ghz; the attenuation of attenuator is 40dB, the accuracy is ± 3.5db, the standing wave ratio is not more than 1.6; the frequency range of power amplifier is 0.9ghz-1.3ghz, and the output power is not less than 5W. The combination of microwave accessories and RF instrument resources such as signal source, spectrometer, power meter and various simulators can realize the resource expansion of RF measurement channel, attenuation and conditioning of high-power signal, microwave power synthesis and other functions. In order to meet the test requirements of microwave RF system, components and other microwave signal performance test in the tested aircraft system.