Abstract: To accurately measure the noise response in the thermal radiation zone of the thermal acoustic progressive wave tube, an acoustic waveguide test system with an effective measurement frequency range of 20-1000 Hz was designed based on the duct acoustics and the acoustic finite element analysis. Verification tests were carried out at room temperature. The results show that the acoustic waveguide test system meets the design index, and the numerical analysis method used in the design stage is effective. Finally, the environmental adaptability of the acoustic waveguide test system was evaluated through thermal acoustic test, which proves that the system could withstand the thermal noise test environment of 700 ℃.