Abstract: The aim of this study was to study the nutrient elements dynamics during litter decomposition in Cunninghamia lanceolata forests with different C/N ratios, so as to provide reference for scientific management of Cunninghamia lanceolata forest. The decomposition bag method was used to observe Cunninghamia lanceolata litter decomposition for 300 days. Four kinds of exogenous C/N treatments were set up: C/N ratio 60.86 (CK), C/N ratio 40.57 (N1), C/N ratio 30.45 (N2), C/N ratio 20.25 (N3). The nutrient contents in the decomposition process of Cunninghamia lanceolata litter in different stands were determined and analyzed. The results were as follows: (1) During the decomposition of Chinese fir litter, the C/N and C/P ratios were lower than the initial value, while the N/P ratio was higher than the initial value; (2) The concentrations of N, P, Ca and Mn were higher in CK treatment, and there were significant differences in the concentrations of P, Ca and Mn among different treatments; (3) During the litter decomposition, C, K, Ca and Mg all showed nutrient release, N showed nutrient enrichment, and P and Mn showed enrichment phenomenon during 180-300 days of decomposition, but on the whole showed nutrient release; (4) Decomposition time had great influence on seven elements (N, C, P, K, Ca, Mg, Mn) and three element ratios (C/N, C/P, N/P). There was a significant negative correlation between N and stand, a significant positive correlation between C/N and stand, a very significant negative correlation between different C/N treatments and Mn, and no significant correlation between other elements and stand and C/N treatments. (5) The retention of understory vegetation was useful for the release of C, K and Mg, while removal of understory vegetation is useful for the enrichment of N, Ca, P and Mn. During the 300-day litter decomposition process, exogenous nitrogen had a low promoting and high inhibiting effect on Cunninghamia lanceolata litter decomposition of , and with the extension of decomposition time, the promoting effect weakened and the inhibiting effect enhanced. Cunninghamia lanceolata litter decomposition required a low C/N ratio and a large demand for phosphorus. The research results could provide scientific basis for the management of Cunninghamia lanceolata forest.