Abstract: Central bud of Lilium davidii var. unicolor was selected as the material of this study. The central buds were divided into two groups, with and without root of basal plate. Materials were treated with GA₃ （0, 50, 100, 150, 200 mg/L）, NAA （0, 50, 100, 150, 200 mg/L）, 6-BA （0, 1, 2, 3, 4 mg/L） and rooting powder （GGR, 0, 1, 2, 3, 4 mg/L） to explore the effects of different plant growth regulators on bulb growth and plant height,and find the optimum plant growth regulator for the central bud of Lilium davidii var. unicolor. Results showed that when using central bud of Lilium davidii var. unicolor for propagation, it was not necessary to perform tedious root cutting. The application of low concentration of GA₃was beneficial to the growth of plant and bulb.

Key words: Lilium davidii var. unicolor, central bud for propagation, plant growth regulator, growth and development