The desert region possesses abundant scenic and thermal resources， yet the causal relationships between the constructed scenery and the heat infrastructure and their impact on the regional ecological environment remain inadequately understood in terms of mechanistic understanding.Conducting research on the ecological environmental impact of regional wind-solar-thermal infrastructure development holds great significance in guiding the advancement of clean energy and promoting socioeconomic growth within the region.This study focuses on the Tengger Desert as its research area.Using the Google Earth Engine cloud platform （GEE） and Landsat 8 remote sensing images obtained in 2000 and 2022， the investigation employs diverse analytical methods such as land use dynamic degree， land use transfer matrix， ecological environment quality index （EEQI）， landscape pattern index， and geographically weighted regression model （GWR） to evaluate the impact of wind-solar-thermal infrastructure development on the regional ecological environment.The findings indicate that： （1） The land use/land cover （LULC） in the sandy area exhibited apparent spatial and temporal heterogeneity， with sandy land， low-coverage grassland， and Gobi being the main land use types.Notably， the proportion of sandy land accounted for 69.10% to 72.72% of the total study area.In terms of the changes in land use types before and after the construction of the wind and solar power base from 2000 to 2022， the regions with substantial alterations were primarily distributed at the southeast and southwest edges of the sandy area.（2） Over the course of the past 22 years， the highest degree of land use dynamics was observed in industrial and mining construction land， with a notable percentage of 0.11%.A significant portion of sandy land has been transformed into industrial and mining construction land， where approximately 80% of this land was designated for wind and solar power base development.Consequently， sandy land has emerged as a pivotal contributor to the expansion of wind-solar-thermal infrastructure.（3） The regions with the highest EEQI values primarily encompass the middle and lower reaches of the Shiyang River， as well as the southwest and southeast edges of the desert.The concentrated area of the wind and solar power base displayed an increase in EEQI ranging from 0.25 to 0.87， denoting a considerable improvement in ecological conditions.（4） The construction of the wind and solar power base results in a reduction in the dispersion degree of landscape elements in the region， an enhancement in the fragmentation degree， and a more complex spatial structure.Additionally， the diversity and heterogeneity of the regional landscape were improved.Moreover， following the construction of the wind and solar power base， there was a consistent increase in the regression coefficient of the sandy area， exceeding 2.5 on average.This improvement contributes to enhancing the regional EEQI and further strengthens the correlation between LULC and ecological conditions.As a result， the beneficial changes in land use that accompany the construction of the wind and solar power base serve to promote the improvement of ecological environment quality and landscape patterns in sandy areas.