Abstract: The forest belt belongs to one part of the types of windbreak belt at the northeastern margin of the northern Ulan Buh Desert.Based on the observations and investigations of the forest belt in the section of Baleng commune of Dengkou-county ic 1976,the facts show that it is better to adopt multibelts with sparse structure between the desert and the oases, because of their good effects of wind prevention and sand resistance at present.The serious sand accumulation behind and within the forest is an outstanding problem.The utilization of clay to cover the dunes can temporarily play a certain role in the protection of the existing forest belt', but under great amount of sand fixation by plants and the coming from the windward side, if the measures of sand fixation by plants and the revegetating practices are not adopted simultaneausly, the forest belt will be extensively buried by sand and lose its function. Thus the authors have proposed some suggestions for the remaking of the existing belt, sand fixation by plants as well as revegetating the saudy land.