Abstract: The micro-Doppler effect induced by the rotating parts of the target, which provides a new approach for accurate auto radar target recognition, attracts great research attention in recent years. In this paper, taking target with rotating parts for an example, a method for the application of Duffing oscillators to micro-motion feature extraction of radar target under low Signal-to-Noise Ratio (SNR) is proposed. The echo of the rotating parts after multiplying with the conjugate of the reference signal is constructed by several sinusoidal components. Therefore, the Duffing oscillators are used to detect the sinusoidal components of the echo signal. Then, the power of the range cells on the range-slow time plane corresponding to the frequencies of the detected sinusoidal components are enhanced. Finally, the micro-motion feature of the radar target is obtained by the Hough transform. A computer simulation is given to verify the effectiveness of the proposed method.