A novel biparametric OS-CFAR(BOS-CFAR) detection method for AEW radar in the sea clutter is proposed.The performance is discussed and analyzed for multiple-pulse noncoherent integration when this method operates in the multiple-target environment in the non-Gaussian sea clutter background. Theoretical analysis and simulation result show that the proposed method can enhance the CFAR detection performance for AEW radar in the sea clutter background effectively.