Abstract: The results of investigation showed that: there existed obviously a "slow-fast-slow" growth rhythm in height growth process of one-year-old Cinnamomum platyphyllum seedlings. This growth process could be simulated with Logistic curve. The different growth stages could be divided with derivating the Logistic equation. There was a positive correlation between rate of height growth and rate of leaf area increament. The nitrogen (N) content in leaf of the seedlings was the first important for height growth, phosphorus (P)content was the second, and then was potassium(K). The growth rate of height was closly related to air temperature. Proper shading, irragating in time as well as solving the contradictions between the supply and demand for water, fertilizer and temperature at the fast growth stage were the key techniques for growing good saplings.

Key words: Cinnamomum platyphyllum, Seedling height growth, Logistic equation, Enviromental factor