冲击回波法是近几年来新兴的一种超声检测方法，它是采用落球、锤击等方法在被测物件中产生应力波，用传感器接收回波，然后用时域或频域分析回波反射位置，以判断混凝土中缺陷位置的方法。本文就冲击回波法测量混凝土厚度及缺陷的问题进行了探讨，并利用冲击回波法进行了现场检测，以此促进向工程实用化发展。 Impact echo method is an emerging ultrasonic detection method in recent years. It uses falling ball, hammering and other methods to generate stress waves in the measured object, using the sensor to receive the echo, and then using the time domain or frequency domain to analyze the echo reflection. Location to determine the location of defects in concrete. In this paper, the problem of measuring the thickness and defects of concrete by the shock echo method is discussed, and the shock echo method is used for on-site inspection, which promotes the practical development of the project.