The testing method of RTCA/DO-160G section 20 has been widely utilized in civil aviation sector to verify the susceptibility of electronic equipments both at the system and at the unit level. Based on the procedure of section 20 originated from RTCA/DO-160G, a theoretical model of calibration phase was proposed by means of scattering parameter and validated its effectiveness through measurements, besides, the performance of injection probe also play a major role in conducted susceptibility test, Secondly, the corresponding susceptibility evaluation model was proposed based on the test signal test method, the obtained minimum susceptibility thresholds are 26 and 26.1 dBm, which indicates good agreement with theory, Finally, a measurement uncertainty evaluation based on monte carlo method is conducted. The expanded uncertainty is 2.60 dB lower than the value specified by CISPR, which indicates it can be a evaluation criteria for the susceptibility phenomenon occurring during the conductive susceptibility test. This paper is aimed to provided theoretical reference and practical foundations for conductive susceptibility of Beidou airborne receiver.