Abstract: An introduction is made to the method and techniques of calculating the post transportation quantity and load turnover when a computer management information system is applied to the postal transportation. Using the Winter multiplication method, a prediction model for transportation quantity is built for provincial postal transportation enterprises. Then, a study of the self-adapting correction technique of this model is made fromthe aspect of practical application. Finally, the kernels of software design of the prediction model are described, with a flow process diagram and a computational example presented.