The method of detecting the Alcohol concentration on line by using ultrasonic technology is presented. The principle, composition and software design of the on line concentration detector based on rnthis method is introduced concretely. The accuracy of the detector is better that 0.2%.%介绍了利用超声技术进行乙醇浓度的在线检测方法，具体介绍了采用该方法研制成的浓度在线检测仪的原理、组成和软件设计。该仪器的测量误差小于0.2％。
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