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Aiming at the safety problems such as the death caused by high temperature and the injury caused by gas pollution inside the vehicle in recent years, an anti-legacy monitoring system for in-vehicle personnel based on Multiple Input Multiple Output (MIMO) radar and high-precision Beidou positioning is designed. The system uses MIMO radar as a way to detect human body, adopts high-precision beidou positioning vehicle motion detection method, and integrates existing mature temperature, gas sensor technology and 4G communication technology,and uses the software based on Matlab APP Designer as a configuration and test software. The hardwore terminal of the system is independent and miniaturized, which can be arranged in multiple places in the car, and the data changes of each sensor can be observed on the software. The system realizes the functions of vehicle motion detection, human body detection, environment monitoring and data wireless uploading in the car.The system verifies the feasibility of the system monitoring inside a car, which can also provid an independent, convenient and efficient new method for interior life monitoring.