Abstract: In this paper, a typical amplitude feature point recognition and extraction scheme is proposed in the online monitoring system. By extracting the feature points and correlating the calculation, the performance of the hardware system is reasonably and appropriately judged and evaluated in time. Furthermore suggestions on whether the relevant personnel was needed to carry out on-site maintenance were put forward. The experimental data and analysis results show that it is feasible to judge the performance of the system by feature point analysis, and it has a positive effect on the long-term monitoring of the health status of the ultrasonic equipment.