Ecological restoration in the semiarid areas of Gansu Province is very difficult because of the harshenvironmental conditions such as soil water shortage and serious shortage of water for ecological use.Thispaper presented the measures like"grazing and cutting prohibition,enclosure before planting,sparsenessfirst and then densification in plantation,and planting dominated by shrubs in combination with trees andgrasses".The rational certification was then made from the aspects of water balance,soil moisture,droughtresistant,tree growth,etc.The average soil water contents for one year enclosure and no enclosure were 8.40% and 5.03%,respectively.Compared with poplar with the densities of 2m×2m and 2m×3m,theheight of poplar with the density of 1.5m×3m was improved by 71.8% and 17.5% and the diameter atbreast height,by 91.6% and 12.0%,respectively.Compared with Chinese pine with the densities of 2m×2m and 2m×3m,the height of Chinese pine with the density of 2m×4m was improved by 49.1% and13.9% and the diameter at breast height,by 59.4% and 23.5%,respectively.The diameter at breast height and theheight of pepper with density 2.5m×6mwere improved by 8.1% and 13.0% compared with pepper with the density 3.5m×3.5m.The moisture and nutrition areas for single arbor and shrubs were 25and 14m²,respectively.