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Research on driving force and the change of landscape pattern of land utilization can discover the disciplinarian from out-of-order distributing of patch.The space-time changes of landscape pattern of land utilization were in terms of LandsatTM data during 2000 and 2005 based on GIS and RS techniques.The principle and technique of landscape ecology were used to study the landscape pattern changes,and the land utilization driving force of Zhangye City was discussed in terms of natural and human factors.Results show that the grassland is the matrix of the study region,and the mixed grassland landscape pattern is composed of grassland and relative principal parts of unused land,woodland and arable land.Different landscape types changed at different degree,In 2005,the area of grassland is 21189.12km2,decling 1.39% rather then 2000,and the woodland is 3818.13km2,increasing 11.4%.And the area and patch number of unused land changed obviously.Natural environment is the basic condition of landscape pattern of land utilization,and the land cover pattern directs human actions in land utilization and the human factors is the guiding factor for the land-use change,which can by directly shown in the water redistribution in Hei River,the conflict of increasing population and land-use.With the support of economic development and planning principles for land utilization,the sustainable utilization and development of land could realize by rational development and conservation of the land in the study region.