This application model, by the means of installing vehicle magnetic detector (VMD) in every parking space, carries out various intelligently-managed tasks such as dynamical supervising, emitting parking guidance signals to the drivers, preventing car from illegitimately occupying the parking space, as well as cutting the in-door light cost. Whenever a car is parked, the iTag S0 or R0 installed in the parking space will automatically detect the occupation and recognize the vehicle-mounted device installed in the car, such as iTag V1. Relevant information will be sent to the backend via the signal concentrator. If the parking space is illegitimately occupied, alarm signals will as well be sent to the backend, providing an intimate, free-from-worry, and high-class management service.