In this work the features of Brownian movement of macromolecules were introduced. The fundamentality of Brownian movement in modern polymer physics was discussed from the relationship between Brownian movement and flexibility of polymer chain; from the competition of macromolecular motions with the macromolecular interactions

and from the relationship between macromolecular motions and the entropy induced phase transition as examples. It is indicated

that the researches into Brownian movement have very important meanings for understanding the features of polymer structures and polymer performances.