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A network topology based on Control Area Network (CAN) special for parking lot to construct the parking guidance and information system (PGIS) is put forward. Through analysis of the parking logic division and parking lot information anatomy, the architecture with star topology is explored. On this base, the information of parking lots is classified in detail and the network suitable for transmitting the information is designed. In order to test the reasonability and feasibility, an experiment is carried out lastly.