Based on the analysis of ancient natural vegetation landscape and present-day vegetation zonifications as well as artificial vegetation growing situations, it is con-sidered that the zones with rainfall of over 550 mm are suitable for forests to grow so that forests are growing much better and these zones can be classified as the artificial tree belts,while the zones with rainfall of 400-550 mm where trees are evi-dently dwarfed can be classified as the dwarfed trees and shrub belts, The better vegetation can be constructed over most of places on the Loess Plateau, Meanwhile，based on the well -preserved natural vegetation cover and extension of artificial vegetation cover percentage in close combination with Chikugo method and the estimation from the regression equation with field surveying data, it is suggested that thevegetation percentage in forest belt on the Loess Plateau reach 90%一100% under the natural conditions (without any damagss caused by human activities)while that cover the forest and grassland belts (with rainfall of 400-500 mm) reach over 80%.