This paper presents a new dual microphone noise suppression method with robustness against variations in microphone gain characteristics. The method has a BeamFormer (BF) and a 3-stage gain calculation block consisting of “Separation Gain”, “Post Gain” and “Relaxation Gain” in the frequency domain. Each gain value has its own particular role, and an appropriate gain is calculated based on these gain values. The proposed method was applied to a dual microphone headset. The performance was shown by subjective test and by objective test using PESQ and ΔSNR score.