Cryptomeria fortune is a special coniferous species with very high economic value and plays an important role in carbon sequestration and atmospheric purification in China. In order to explore the effects of climate warming on the litter decomposition, the decomposition experiment of Cryptomeria fortune leaf litter in three sites (Qiandaohu in Zhejiang Province, Dinghushan in Guangdong Province, and in Jianfengling in Hainan Province) were conducted along with climate gradient, using litterbags method. The sites represented the mid\|subtropical area, southern\|subtropical area, and tropic area, represently, they are with different temperature. The results indicated that significant difference(P＜0.01) was found for litter decomposition rates in three sites, and litter decomposition rate was ranked in the order of Jianfengling>Dinghushan>Qiandaohu along with the gradient. We also found that annual decomposition rates of leaf litter in Qiandaohu was significantly correlated with the initial C/N (P<0.05), it was significantly correlated the initial nitrogen content in Dinghushan (P<0.01). Insignificant relationship between decomposition rate and litter substrate was found in Jianfengling site. The result approved that the influence of climatic gradient on litter decomposition is important.