We investigated the quantity and composition, annual decomposition process decomposition rate and nutrient dynamics at different depths of the litterfall in a Larix principis\|rupprechtii stand in Guandishan Mountains, using field collection container, burying of the decomposition bags at different depth and laboratory analysis. The results showed that the total amount of litterfall was 19.15 t?hm-2?a-1, of which 35.7% was for leaves, 54.4% for twigs, 6.7% for flowers and fruits, and 3.1% for barks and other materials. Furthermore, the month by month annual dynamics of the forest litter appeared to be single climax curve, in which the highest point occurred in October, while the different components had different decomposition rate. The residual litter in the Larix principis\|rupprechtii stand was 9.803 t?hm-2 with a decomposition constant of 1.95. The decomposition rate at different depths varied significantly. The annual weight loss of new defoliated leaves was 29.82%. The decomposition half life was 1.5-2a, while it took 7-9a to reach a decomposition proposion of 95%. During the decomposition process, the dynamics of nitrogen, phosphorus and potassium showed different patterns. The enrichment of nitrogen gradually increased in most of the year, but decreased at the sencond hall of the year. The enrichment of phosphorus decreased before July, but increased rapidly after that and slowed at the end of the growing season. The potassium content decreased all the year being washed off in the decomposition process without any enrichment.