Abstract: Plantations of 14~59-year old Larix principis-rupprechtii in Mulan Forest Farm of Hebei Province were selected and both biomass and carbon storage in the tree organs and the components of the plantation analyzed. Carbon storage in the stem of L. principis-rupprechtii forms the highest proportion of the plant total carbon storage. The proportions of carbon storage of soil and trees are highest in the plantation.L. principis-rupprechtii carbon density is 206.02 t·hm^-2, while those of the trees and soils are 27.58 t·hm^-2 and 157.14 t·hm^-2 respectively. The fitted equations for carbon storage (C) and forest biomass (W) at growth stock (M) are W = 10.210 1 + 0.732 1M, C = 5.188 4+0.373 6M. That for soil carbon density (Soc) at forest age (A) and dominant tree average height (H) is Soc = -24.635 6-5.606 1A + 14.936 0H + 0.439 8AH. Accordingly, total carbon storage in Mulan Forest farm is 571.43×10⁴ t, basic tree biomass and carbon storage are 150.00×10⁴ t and 76.49×10⁴ t respectively, while soil carbon storage is 435.85×10⁴ t.