Abstract: A method based on EMD(Empirical Modal Decomposition) for X-ray detection and extraction for tiny flaws in composites was presented. This method took advantage of information entropy and PSNR (peak signal to noise ratio) to control EMD decomposition order and realize the optimum extraction of defect characteristics. By using experiment and image segmentation, it could segment tiny flaws effectively. Comparison with traditional methods, it could extract tiny flaws from material structure and image noise, detect all types of tiny flaws in any direction and extract other material characteristic which lack of commonality and had specific applications.