Grassland ecosystems support diverse avian communities whose composition and abundance are strongly influenced by vegetation structure. This study examines the relationship between avian diversity patterns and vegetation characteristics across temperate grasslands. We conducted comprehensive bird surveys and vegetation assessments across 45 grassland sites over three breeding seasons (2021-2023). Our findings reveal significant positive correlations between vegetation structural diversity and avian species richness (r = 0.78, p < 0.001). Grasslands with heterogeneous vegetation structure, including varying grass heights and scattered shrub patches, supported 40% more bird species than structurally uniform habitats. These results highlight the critical importance of maintaining diverse vegetation structure for grassland bird conservation.