The growth parameters such as height growth

diameter growth and the divaricates of the 2-year-old nursery stocks of Pinus edulis were analyzed

and different growth stages to height growth are determined by sequence cluster analysis.The result showed that height growth of the Pinus edulis was evidently characterized by the twice rapid growth stages.However

the considerable 5.64 cm increment of height growth occurs in the first rapid growth stage(April 11-June 30)

and the increment at this stage accounts for 70.4% of the total increment in the whole year.It is the most important stage of fostering high quality nursery stocks of Pinus edulis.The diameter growth resembles and cooperates with the height growth.