Abstract: Researches on developing seedling raising cultivation of Alnus nepalensis and Betula alnoides and establishing of 27 hm² hectares of demonstration forest were conducted by using "Aluns nepalensis of Yunnan No. 1", "Aluns nepalensis of Yunnan No. 2" and "Betula alnoides of Pu,er No 1" as the seed source in Mangzhang township of Yingjiang County of Dehong Prefecture. In planting experiment fields, sample plots were set on the different slopes at the same elevation and the work was repeated 3 times,and researches were conducted on the effect of the different slope directions on the growth of "Aluns nepalensis of Yunnan No. 1", "Aluns nepalensis of Yunnan No. 2" and "Betula alnoides of Pu,er No 1". The tree height and diameter were measured after one year of afforestation,and the multiple comparison method was used. The results showed that the slope direction had a significant effect on the tree height and diameter of each species. In the seedling growth period,the growth on the shady slope was better than that on the sunny slope.