Using the Inner Mongolia Autonomous Region as an example, this study proposes a classification method that integrates the effects of ecological improvement into the evaluation of ecological service functions, based on the relationship between land use and ecosystem services value (ESV), and analyzes the spatial distribution patterns of ecosystem service functions. The results showed that (1) the ESV of the study area was 1.87 trillion yuan in 2015, and overall environmental quality improved; (2) the ESV improvement in the study area was spatially differentiated. The areas of greatest improvement were concentrated in areas of high ecological value. Ecological improvement was not obvious in other areas, resulting in a widening gap in environmental quality in the region; (3) a high degree of correlation was seen between ecosystem services and the rate of ESV improvement. The study area could be categorized into two high value zones, namely Daxinganling and a high-cover grassland area, as well as three low value zones, namely the Sandland, Yellow River, and Horqin areas. Ecological management should be based on ecological service function and its relationship with ecological improvement to reduce the gap between regional ecological values and, thus, promote the coordinated development of Inner Mongolia's ecological environment.