Parking-space information detection method

The invention relates to a parking-space information detection method. A wireless ultrasonic detector which is comparative high in precision and works in an intermittent method comparative low in average power consumption is installed at each parking space and wireless communication is adopted so that construction is simplified. At the same time wireless geomagnetic vehicle detectors are installed at the entrance and exit of a parking lot so that high-accuracy real-time detection is carried out on vehicles at the entrance or the exit. If a vehicle enters or exits, the event triggers the wireless ultrasonic detection device at each parking space to carry out passive detection once so that wireless parking-space information detection which is high in instantaneity, low in power consumption, high in precision and simple in installation is realized. The parking-space information detection method not only achieve high accuracy of detection, but also capable of realizing an objective of low average power consumptio