The invention provides a parking requirement prediction method based on an OD matrix, comprising steps of obtaining electronic police data in a preset time range, obtaining the OD matrix based on track tracing, and predicting the parking requirement according to the OD matrix obtained from the step 1. The parking requirement prediction method based on the OD matrix can present the practical condition of the travel, reasonably and accurately predicts the parking requirement of the small community, and provides the scientific decision support for the city planning and parking planning. Besides, the invention also provides a computer system for calculating the parking demands.