Due to the influence of clutterthe SAR echo of rotational target rangecompressed domain presents a discontinuous sinusoidwhich makes it difficult to be detected.A new algorithm based on subaperture Hough Transform was proposed to detect rotational target.The detection time duration is divided into multiple coherent processing intervals (CPIs) for integration.The echo in same range cell was coherently integrated via Fast Fourier Transform (FFT) within each CPI to increase SNRand noncoherent integration was made among all CPIs via generalized Hough transform for clutter reduction.The proposed approach is suitable for singlechannel SAR system that has a lower hardware cost.The twostage detecting method has better performance on clutter cancellation and rotational target detection.The results of the simulation indicate the effectiveness of the method.