Abstract:The most important problem in the afforestation with Pinus sylvestris var. mongolica is physiological drought. Some provinces have adopted the method of "burial in soil" to prevent this phenomenon. But the method has three shortcomings: hight cost; liable to damage the seedlings; difficulties in grasping proper time. During the research and experiments in eleven years (1975—1987), a new technique was explored: Planting seedling near the southern wall of a deep hole and burying it with soil. This technique can create a favourable microenvironment for seedlings without wind and direct radiation but with more moisture because the seedlings are snow-covered and moderaely grass-covered for a long time. The success in the afforestation with Pinus sylvestris var. mongolica in 2660ha and the results of the simulated tests show that the new technique has good effect on preventing physiological drought of P. sylvestris var. mongolica in the northern China.