Abstract: When some special sensors are used to measure parameters, the original measurement position needs to be determined after the sensor is removed. For example, after using the acupoint sensor to measure the abnormal performance of multiple meridians and acupoints of the patients, it is necessary to determine the actual position of abnormal acupoints and apply the intervention measures to them, which can relieve the pain and improve the physical condition of the patients. To solve this problem, the memory tracking problem of the sensor was studied, and a vision-based memory tracking method of sensor location was proposed. The AprilTag was pasted on the sensor and the tested object respectively. In the process of measurement, the AprilTag detection algorithm was used to calculate the position relationship between the sensor and the tested object. After the sensor was removed, the measurement position of the sensor was tracked by using the position relationship and AprilTag on the tested object, and the tracking accuracy was within 1 mm, which could provide reference for the further disposal