Abstract: In order to properly forecast the actual demand for parking place,the paper has also introduced the main methods of forecasting the demand at present time and its characteristics.Then it establishes the parking demand-supply forecasting model based on parking generation rate model.The model considers the price and parking service level's impacting on the number of parking demand.Considering the parking lot's turnover rate and utilization ratio in the model,we can know how much parking seats should be built.At the same, the demand for parking has been respectively estimated during the different period of daytime and nighttime. At last,it gives a calculating example.