The natural P.screnkianavar.tianschanica forestation on the lower limit of elevation range of 1450～1800 m. The results showed that the effect was significant by the 3 treatments of cross and straight cutting brushes along the mountain slope with motor chain saw and group planting of P.screnkiana var. tianschanica; by big hole-site preparation and group planting in the brush land and trembling poplar clear cutting slash, the P.screnkiana var.tianschanica sampling(15 a) were 40.0% and 46.5% higher than CK. The excellent and poor consequent succession of spruce sampling growing in the different sitetype was brush land> trembling poplar clear cutting slash> trembling poplar> P. screnkiana var.tianschanica clear cutting slash.