Abstract: For thb purpose of seeking for the effective ways to increase site produotivity, the dyanamic of nutrient elements and tbe biomass of withered andfallen matter of Pinus sylvestris. var. mongolica plantation which was plan-ted in 1967. were periodically investigated, since 1980, at a test sitein Mao Ershan experimental forest. After 5 years investigation, the researchresults about the distributed pattern of withered and fallen matter and itsnutrient elements were achieved. The dry weight of withered and fallenmatter per hectare is 2790.2 kilogram in which needle leaf account for43.64% of the total dry weight;branch 13.1%;bark 24.28%;cone 6.89%;broad leaf 11.85%;branch of broad-leaved trees 0.4%. More details about quantitative analysis of the distributed patterns ofwithered and fallen matter and its nutrient elements in different componen-ts, seasons and stands with different age will be discussed in this paper.