Abstract: In the field of wind tunnel aerodynamic noise testing, there is an urgent need to apply flexible probe microphones for high-precision acoustic measurements. This paper proposes a calibration method for flexible probe microphones based on the calibration of the surface sound field and transfer function correction of the body model in wind tunnel noise testing. The principle of model surface sound field calibration based on comparison method and the calibration method of flexible probe microphone based on transfer function correction were introduced respectively. On this basis, the surface sound field of the body model was calibrated using a standard microphone with known acoustic characteristics, and the transfer function correction of the flexible probe microphone was calibrated. Blind signal validation tests were conducted based on the calibration results, and the experimental results showed that after the transfer function calibration correction, The blind signal testing error of the flexible probe microphone has been reduced from 12 dB to 0.18 dB in the frequency range of 0～20 kHz, verifying the effectiveness and accuracy of the calibration method based on transfer function correction for flexible probe microphones. It can meet the accuracy requirements for acoustic measurements using flexible probe microphones in wind tunnel aerodynamic noise tests.