To estimate the aboveground biomass of Pinus rigida and Pinus rigida × taeda 22-year-old plantations, the experimental plots of 200㎡ in size located in Kwangju of Jeonlanam-do were selected. Nine sample trees selected at each plot taking account of DBH distribution were felled and the diagram of oven-dry weight distribution of stem, branch, and needle for each 1m segment was constructed. The logarithmic regression equations between dry weight of each component (stems, branches, and needles) and the variable of (DBH)²-H were obtained.. The aboveground standing crops was estimated to be as much as 71 .61 and 142.32 tons of dry matter per hectare in P. rigida and P. rigida × taeda stand respectively. The net production was estimated as 10.81 and 10.46 t/㏊/yr and the net assimilation rate 1.32 and 1.00 ㎏/㎏/yr in P, rigida and P. rigida × taeda stand respectively. And the efficiency of needles to produce stem was 0.97 and 0.81 ㎏/㎏/yr in same order.