Abstract: In order to investigate the decomposition characteristics of litter in evergreen and deciduous broad-leaved mixed forests in the Rainy Zone of West China, samples of broad-leaved, Cryptomeria fortunei, herbaceous and their mixed litter were collected in Longcanggou National Forest Park. The changes in litter quality and nutrient elements over 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 20-60%; (2) The decomposition rates of herbaceous, broad-leaved, and mixed litter were highest in the early stages and showed seasonal variations, while the decomposition rate of Cryptomeria fortunei was highest in the later stages and showed no seasonal variations; (3) The decomposition of mixed litter exhibited a non additive effect, with each component showing a synergistic effect before 1.0 a and an antagonistic effect after 1.0 a. The decomposition rate of the mixed litter decreased the most in autumn and winter, with the accumulation of C, N, P, and K, making it most sensitive to seasonal 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 concentrations of C, N, and P exhibited fluctuating changes over 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 was significantly positively correlated with C/N ratio, which imply N plays a key role in the litter decomposition process in this area.