Abstract: Field experiments were carried out to examine the soil respiration rate by LI-6400-09 portable soil respiration chamber in an Abies fabri forest in Gongga Mountain National Nature Reserve. The results showed that (1) the soil respiration rate and soil temperature were different in Abies fabri mature and half-mature forests each month;(2)The soil respiration rate of the two stands had obvious seasonal variation characteristics, which were arranged as:summer > autumn > spring > winter; the average monthly soil respiration rate of mature forest was between 0.82 μmol·s^-1·m^-2~5.88 μmol·s^-1·m^-2, the coefficient of seasonal variation was 50.6%, and the average monthly soil respiration rate of half-mature aged forest was between 0.52 μmol·s^-1·m^-2~3.52 μmol·s^-1·m^-2,the coefficient of seasonal variation was 48.5%; (3)The seasonal variation of soil respiration rate was positively correlated with the soil temperature of 5cm; (4) The Q₁₀ values of soil CO₂ emission rates were 3.2 and 2.6 respectively in A. fabri mature and half-mature forest, the sensitivity index of soil respiration to temperature in mature A. fabri forest was higher than that in half-mature forest.