Abstract:The amount, composition, seasonal pattern of litterfalls and its nitrogen, phosphor and potassium contents in four typical forests (i.e. Alnus-Cupressus mixed forest (A.C.), Cupressus funebris forest (C.P.), Pinus massoniana-Quercus mixed forest (P.Q.) and P. massoniana-C.funebris mixed forest (P.C.) ) were measured in Guansi River Watershed in Mianyang Citiy. The results showed that the mean annual litterfall productions were 4.229,5.133,5.701, 5.351 t hm-2, respectively. The litterfall in A.C. forest was composed of 72.1% of leaves, 8.9% of branches, 11.9% of flowers and fruits and 7.1% of other mixed-matter. In C.P. forest the litterfall of leaves, branches, flowers and fruit, and others amounted to 75.4%, 9.0%, 9.0% and 6.5% of total litterfall. In P.Q. forests the component of litterfall was 79.7%, 11.0%, 6.3%, 0.5% and 2.4% for the leaves, branches, flowers and fruit, pine bark, and others, respectively. These were 60.4%, 9.5%, 16.0%, 7.5% and 6.5% in P.C. forests. The litterfall productions of shrub accounted to 16.4% and 1.5% and 9.5% and 12.1% of total litterfall of the correspondent forests, respectively. The seasonal patterns of litterfall productionyaried with the different stands. The litterfall production peaked at the earlier of growing season and dormancy for P.C. stands, and in December for P.Q. stands. The nitrogen content in litterfall was highest followed by potassiom and phosphor. The amount of N, P and K in litterfall was measured at 62.702, 70.596, 79.228, 80.011 kg•hm-2•a-1 in 2003, respectively.