It is a very serious situation that it is hard to find a parking place in the big city, and it directly results in increasing the invalid traffic flow on the road and making it crowded and jammed. The Parking Guidance System (PGS) is an effective way to figure out the problem and to help the driver find the parking space quickly. Aimed at the situation of hard parking in big city, the systematical construction and design method of the parking guidance system are studied in this research.Firstly, the researc...