This paper proposes a parking demand forecasting method based on consistent feature in parking demand of buildings with similar functions. First, an “influencing factor correction coefficient method” is established based on the parking demand generation rate of different buildings nowadays. The parking demand generation rate of buildings can be forecast with different functions in the planning year. Secondly, the parking demand peak ratio is used to describe the daily distribution of buildings, and “threestep model of parking demand” is established with the concept of shared parking. Finally, the peak parking demand of complex is achieved. This model is applied to a complex project in Shenyang.