Abstract: To provide reference for nursing management and directive cultivation, this article analyzed the growth law of volume of poplar during the 12 years’growth period, using 18 poplar varieties introduced to Jianghan plain as material. The results showed that the volume’s growth pattern of different poplar varieties was in accordance with the“S”curve. The volume had one to three growing peak periods during the 12 years’ growth period. Simulating the volume growth with a logistic equation, the correlation was up to a significant level. The phenological parameter and growth parameters among different varieties were different. The duration of the linear growth phase was from 2.45 to 4.53 years. The percentage of the total linear growth in total growth was above 40%. The correlation of the volume growth in different tree ages was positively significant when the tree age was over three years. Therefore, the tree can be selected in the third year for cultivating five or six years old middle-small diameter timber, and can be selected in the fifth or sixth year for cultivating ten or twelve years old big-diameter timber.