In order to reveal the influence of global warming and nitrogen addition on the ecological process of Chinese fir (Cunninghamia lanceolata) seedlings, we conducted a two-factor experiment of warming and nitrogen addition, which consisted control, warming, nitrogen addition, and warming+nitrogen addition. The study site is located in Forest Ecosystem and Global Change Research Station of Fujian Normal University in Chenda, Sanming, Fujian Province. The results showed that: (1) the absorption rate of nitrate nitrogen by the fine roots of C. lanceolata under different concentrations was higher in spring and lower in summer and autumn, but the absorption rate of ammonium nitrogen was higher in summer and autumn and lower in spring. (2) The absorption of ammonium nitrogen by the four treatments followed the Michaelis-Menten kinetic equation, but the absorption of nitrate nitrogen did not fully followed it, which showed dual-phase kinetics in different seasons. (3) In spring, compared with nitrogen-free addition, nitrogen addition increased the maximum velocity of NH₄⁺ (V_max-NH₄⁺). In summer, compared with no warming, the warming increased V_max-NH₄⁺. In autumn, compared with no warming, the warming decreased the Michaelis-Menten constant (K_m-NH₄⁺); compared with nitrogen-free addition, nitrogen addition increased K_m-NH₄⁺. Warming and nitrogen addition had no significant effect on the absorption rate of nitrate nitrogen at 100 μmol (V₁₀₀-NO₃^-) in different seasons, and there was no significant interaction between warming and nitrogen addition on V_max-NH₄⁺, K_m-NH₄⁺ and V₁₀₀-NO₃^-in different seasons. The results indicated that warming would improve NH₄⁺ absorption capacity of Chinese fir seedlings in summer and nitrogen addition would improve NH₄⁺ absorption capacity in spring and reduce NH₄⁺ absorption capacity in autumn, but warming and nitrogen addition would not change NO₃^- absorption capacity in different seasons.