Tabanidae larvae are common soil animals in Inner Mongolia's typical steppe, with varying densities in different types of grasslands. In the Stipa grandis steppe, the larvae are more concentrated than in the Leymus chinensis steppe. The density of Tabanidae larvae changes throughout the year, with the highest density in autumn. In the Stipa grandis steppe, the larvae are most abundant in the 10-20cm layer of soil. This distribution pattern suggests a trend towards desertification in the area.