Abstract: Sample plot investigations were conducted on three kinds of artificial forest community of 15 years in Puwen Experimental Forest Farm, and analysis was made of the diversity and biomass of the three kinds of forest community species. And the results showed that the biodiversity index and evenness index of Betula alnoides were the largest, respectively 3.06 and 91.82%; the biomass of Betula alnoides was also the largest, its value was 115.. 82 t·hm^-2, and its annual growth rate was 7.72 t·hm^-2, much higher than the local natural tropical forest with 4.184 t·hm^-2. As compared with other positive species, Betula alnoides had a higher growth rate, showing a high production capacity, and as a native species, it could be applied in the tropical afforestation project in Yunnan Province.