Abstract: In order to investigate the decomposition characteristics of litter in evergreen and deciduous broad-leaved mixed forestd in the rainy area of west China, samples of broad-leaved, Cryptomeria fortunei, herbaceous and their mixed litter were arranged in Longcanggou National Forest Park. The changes of litter quality and nutrient elements with time within 2.1 years were analyzed. The research results showed that: (1) The t_95% of Cryptomeria fortunei, broad-leaved, herbaceous, and mixed litter were 11.85, 5.89, 4.03, and 8.13 a, respectively, and the final residual mass rate of litter was between 20 and 60%; (2) The decomposition rates of herbaceous, broad-leaved, and mixed litter were highest in the early stages and showed seasonal changes, while the decomposition rate of Cryptomeria fortunei was the highest in the later stage, and showed no seasonal changes; (3) The decomposition of mixed litter exhibited a non-additive effect, and the compoents showed synergistic effect before 1.0 a and antagonistic effect after 1.0 a. (4) The decomposition rate of four kinds of litters had a doubld release pattern of mass and nutrient component, and the final residual rate of C, N, P, and P was bewteen 20-60%. The changes; (4) The decomposition of four types of litter exhibited a dual release pattern of quality and nutrient elements, with final residual rates of C, N, and P ranging from 20% to 60%. The concentration of C, N, and P basically fluctuated with time; (5) The initial decomposition rate was not completely correlated with the initial C/N ratio, but from the overall decomposition process, the residual mass rate of was significantly positively correlated with C/N ratio, and N plays a key role in litter decomposition process in this area.