Chinese fir,which is deemed as one of the most important species of timber sourced at plantations around Southern China,has shown under extensive research that due to slower decomposition of Chinese fir leaves,the level of soil fertility has diminished considerably within the region.Research has been carried out to investigate the following: (1) whether the mixture of Chinese fir and Phoeba bournei will increase decomposition rates of Chinese fir litter, and (2) whether interactions exist in decomposition rates and show any nutrient releases whilst being mixed and decomposed. The experimental investigation carried out are as follows: (a) single leaf litter of Chinese fir, (b)single leaf litter of Phoeba bournei, (c) mixture of leaf litter,75% Chinese fir and 25% Phoeba bournei, (d) mixture of leaf litter,50% Chinese fir and 50% Phoeba bournei, (e) mixture of leaf litter,25% Chinese fir and 75% Phoeba bournei.Under extensive research and field investigations,it has found that the decomposition rate of leaf litter mixtures between Chinese fir and Phoeba bournei are a lot faster than singular materials and the K release rate is quicker also,however,N and P release rates differ between both singular materials.Leaf litter,when mixed(Chinese fir and Phoeba bournei),accelerates the decomposition rate of Chinese fir litter,even more so when the Phoeba bournei is added in greater quantities,the decomposition rate , N and K release rates of Chinese fir litter show significant proportions of increase.The decomposition rate and K release rate are significantly increased when both materials are mixed together,however,novisible increase is found in the form of N or P.