Considering the target detection in clutter environment, a method using dual tree complex wavelet transform for received echo is presented. By spatial correlation thresholding after decomposing signal, the signal to suppress the sea clutter is reconstructed. A method using moving target detection to suppress the ground clutter is proposed. When the moving target detection (MTD) method is used, the sea clutter effects still exist. By using MTD method after dual tree complex wavelet transform, a good suppression effect can be got and small target in clutter can be detected. This method is applied to a radar signal processing system, and the simulation results show that this method can effectively reduce clutter.