Single factor experiments were used to study the effects of shading intensities (50%, 75%, 100% light) on growth and growth rhythm of one year old Cunninghamia konishii seedlings. Growth indexes (ground diameter, seedling height) of seedlings were measured every 7 d during the experiment. Applying Logistic equation to fit the growth process of seedling height and ground diameter and calculate the growth rhythm at seedling stage of C. konishii. The law of shading affecting seedling growth and growth rhythm was revealed, the dynamic optimization method of light intensity was put forward, and the light condition of C. konishii seedlings was optimized and verified. The results showed that shading significantly promoted the height, ground diameter growth throughout the growth season, and it was the best with 50% light; the effect of shading on the height and diameter growth of C. konishii seedlings at different growth stages was different, so it was necessary to dynamic optimize the light intensity at seedling stage. Logistic equation fitted well the growth dynamics of C. konishii seedlings. 50% light shading intensity significantly promoted the linear growth rate, the maximum linear growth rate and total linear growth of C. konishii seedlings height, ground diameter. Shading significantly advanced the final days of linear growth, shortened linear growth duration of seedling height. Shading significantly delayed the linear beginning days of ground diameter. Dynamic optimization scheme of light intensity in C. konishii seedling stage: 50% light should be used at the stage of t≤133 d, and 100% light should be used at the stage of t>133 d.
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