The paper takes the samples from the information based on the host countries and areas of Olympic Games since 1960s in analyzing the relevant data and information according to the different characteristics of Olympic economy. The main model adopted in the paper is the input-and -output systematic dynamic model (IOSDM); and based on the appropriately revised parameter related to the model, it also analyzes and predicts the direct influence of Olympic Games economy on the tertiary industries in Beijing. The conclusion arrived hereby will provide a scientific foundation for the long-term economic planning and decision making of relevant departments.