In this paper, PM (Preisach-Mayergoyz) model in one dimension is extended to two dimensions. Hysteretic stress-strain relation could be obtained when hysteretic mesoscopic elastic unit (HMEU) is considered.The sound field is calculated using a first-order finite difference equation, and the high-odd-order harmonic waves can be found apparently in the sound field. Then, the received full waves are filtered,amplified, time-reversed, and re-emitted through corresponding receiving transducers. The high-order harmonic waves focus on the micro-damage zone. So this method can be used to detect the micro-damages by nonlinear high-order harmony waves. Furthermore, it also provides a method of the early detection of fatigue damages.