在一块玻璃纤维环氧树脂复合材料板的热压固化过程中，人为加进不同种类、大小及放入深度的薄膜片，并预置一定大小的裂纹、分别利用反射法和透射法获取回波，并对其高速采样及截取，然后进行幅度谱、相位谱、功率谱、相关谱、自相关函数及互相关函数平方包络提取的分析，获得了一些针对不同预置杂质、缺陷的特征． In a glass fiber epoxy resin composite board hot pressing process, artificially add different types, sizes and depth into the film, and preset a certain size of the crack, respectively, using reflection and transmission method to obtain echo , And then sampled and intercepted at high speed, and then analyzed the amplitude envelope, phase profile, power spectrum, correlation profile, autocorrelation function and the square envelope of the cross correlation function, and obtained some features for different preset impurities and defects.