Turbochargers are widely used in vehicles, ships and other fields. With the continuous increase of turbocharger working speed, the problem of compressor aerodynamic noise becomes more and more prominent. For a turbocharger of vehicle, a turbocharger test bench of noise testing was built, and the noise testing and research were carried out under the acceleration and steadystate conditions. The test results show that the random noise dominates in the aerodynamic noise of compressor inlet under the conditions of medium and high flow area and lower than 80 000 r/min. And the blade passing frequency and overall noise both first decrease and then increase with the increase of flow rate. The blade passing frequency and sawtooth noise dominate when the speed is higher than 80 000 r/min. At a constant speed, the blade passing frequency noise first increases and then decreases, and the overall noise decreases with the increase of flow rate. The tip clearance and random noise dominate in the low flow and high pressure ratio area close to the surge point.