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A new scientific monitoring method based on Hall effect is proposed to solve the problem of low degree of automation and low reliability, low monitoring data and low measurement accuracy. This method uses a number of Hall devices to form an array, the settlement of the magnetic distribution in the soil, the settlement of the soil will lead to the settlement of the magnetic ring to follow the settlement, so it will cause the Hall device magnetic field around the corresponding changes. The Hall effect is used to monitor the strength of the magnetic field around the Hall device and converted into the corresponding electrical signal. The data collected by the RS485 bus is used to upload the data to the experimental host in real time. The host model is found in the scientific modeling of the experimental data. Displacement and electrical signal relationship, and design monitoring management platform to achieve real-time monitoring of soil settlement. The experimental results show that the maximum accuracy of the monitoring method is 0.4 mm, the stability is good, and the multi - point real - time monitoring can be realized in order to realize the intelligent high - precision monitoring of soil settlement. This design can be combined with the current remote transmission control technology to achieve remote sharing of data, with a wider range of applications