In recent years, people have more and more stringent requirements for aircraft noise. Airworthiness standards have put forward more and more strict requirements on the aerodynamic noise level of civil aircrafts. This article introduces a number of typical aero-noise research results conducted in Beihang University’s D5 aeroacoustics wind tunnel and D7 aeroacoustics wind tunnel in recent years, focusing on the noise mechanism and noise reduction techiniques of lifting devices, landing gears, cavity components and bluff body components. It provides scientific basis and experimental data for improving cognition in this field and low-noise aircraft body design.