Developing logistic based on e-commerce has been a hot point in the logistical field ,but putting the e-commerce logistic into reality still need further research .This paper suggests a logistical discount model. This model was directed by the ideal of logistic integration .The transportation discount was taken as a main instrument to reflect this idea. This model can be adopted by the fourth logistical company which want to make a profit from e-commerce logistic. After an analysis, the author gives an algorithm about the model.