[Objective] The dynamic changes of impervious surfaces were analyzed and monitored to provide a basis for urbanization and environmental quality evaluation.[Methods] Xi'an City was taken as the study area, and remote-sensing imagery of Landsat series in 1995, 2000, 2006, 2010, and 2016 were used to extract impervious surfaces by means of a linear spectral mixture analysis method. Subsequently, spatial-temporal changes of impervious surfaces during 1995-2016 and the driving forces were analyzed.[Results] ① The proportion of impervious surfaces in Xi'an City increased, with the average annual growth rate being the minimum from 2000 to 2006 and the maximum from 2010 to 2016. The maximum growth period in the main urban area was from 2006 to 2010. ② In terms of spatial changes, before 2006, the impervious surface was in a concentric pattern, with the main urban area as the core that radiated outward. After 2006, the impermeable surface of each district and county and the main urban area expanded greatly outward, showing one main center and multiple subcenter modes. ③ Population size, economic development, industrial structure, and planning policies were closely related to the increase of the impervious surfaces of Xi'an City.[Conclusion] The spatial-temporal changes of the impervious-surface expansion in Xi'an City basically reflected the planning requirements. In the future, the construction of a subcentral city should be strengthened, the ecological environment should be vigorously protected, and the relationship between urbanization and impervious-surface expansion should be handled properly.