The natural area of Bolykharnxay province, Lao PDR is 1,203,105.00 ha. The research results show that: in rich forest, there are 29-35 species with tree density of 691 trees/ha, DBH of 23 cm and tree height of 12.21 m and the average wood volume of 345.224 m3/ha. In medium forest, there are 35-42 species with tree density of 605 trees/ha, DBH of 18.84 cm and tree height of 11.07 m and the average wood volume of 169.988 m3/ha. In poor forest, there are 31-39 species with tree density of 473 trees/ha, DBH of 16.04 cm and tree height of 10.20 m and the average wood volume of 81.331 m3/ha. The regression of Hv,/Dl.3, D/Dl.3 are both existed with high correlation coefficients. The percentage of wood volume at levels of reserve, adjacent and mature change dramatically among the different forest status. The regeneration tree structure in poor forest is from 13 to 15 species, in medium forest is from 20 to 22 species and in rich forest is 13 to 17 species, mostly concentrated distribution with rather low rate of prospective regeneration trees. During the past 3 years (2010-2013), the wood volume growth of rich forest is highest with 7.205 m3/ha/year, medium forest 4.495 m3/ha/year and poor forest of 2.901 m3/ha/year.