| The artificial Pinus tabulaeformis forest of 30 years old on Daqing Mountain was studied in this article, the analysis of the growth procedure, biomass and LAI of different densities in the similar site condition show:(1) The amount of growing stock, the timber density, the ratio between height and diameter breast height and the timber height, all these have positive correlation with the stand densities, the timber volume and the mean diameter breast height change great at the stand densities range of 2200~3300 stock/ha and has negative correlation with the stand densities.(2) Individual biomass above the ground decrease from 22.48kg to 13.04kg as the stand density increase from 2200 to 3300 stock/ha; The distribution of the biomass of the individual organ is that stock occupies 48.70%~60.35%, branches occupy 21.17%~26.35%, leaves occupy 9.47%~14.92%, cortex occupies 7.29%~12.95%, cones occupy 0.45%~1.94%.(3) Tree analysis shows, the growth speed of the diameter breast height changes with the tree age, the biggest speed is different in the different sample area, it is 27a when the stand density is 3300 stock/ha. While it is 21~24a when the stand density is 2202, 2933 and 4463 stock /ha.(4) The result of the total growth of the diameter breast height on the different site of northern slope of mountains shows, the diameter breast height in the middle slope is smaller than the top and the base. When the age of trees is 30a, the diameter breast height in the middle is 5.83cm, in the top is 7.10cm and the base is 6.53cm.the trees'age of the base is smaller than the top and the middle when the speed of the diameter breast height is the biggest, the age is 18a and the age in the top and middle is bigger than 21a.(5) The LAI of the artificial Pinus tabulaeformis forest of 30 years has no remarkable correlation with the stand density, the mean LAI is about 6.334s.q.m/s.q.m at the sample range of 2200~4463 stock/ha.
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