Abstract: In traditional classification method, the way of water-absorbing of plant cell is classified as osmosis water-absorbing, imbibition water-absorbing and metabolic water-absorbing. However, the novel classification method in the new version textbook, in which the way of water-absorbing are classified as diffusion, mass flow and osmosis, are introduced. In this paper, internal correlation and difference between the two ways were summarized, so as to make the students better understand the waterabsorbing mechanism of plant cell and contribute to full-dimensional teaching.