The diversity of urban birds is closely related to the avifauna in which they are found, and as semi-independent taxa, urban birds are linked to the surrounding natural taxa through dispersal, thus it is necessary to recognize the conservation of urban bird diversity from the regional scale. Pivot tables were used to analyze the composition and characteristics of urban bird diversity in 21 samples from 7 bird geographic regions, which were clustered in terms of species-genus（family）ratios, food type structure and residence type structure, and then classified into geographic regions accordingly. Mantel test was used to analyze the driving factors affecting the differences in the diversity of urban birds. The results showed that cities were important habitats for birds, with 763 bird species lived in the sample cities, accounting for 50.63% of the total bird species in China. However, the number of urban bird species in the higher taxonomic order was more single than that in the natural regions, and its diversity was more fragile. The feeding habits of urban birds were mainly omnivorous and insectivorous, accounting for 77% of the total. In terms of residence type, resident birds accounted for the largest proportion, about 36% of the total species. Based on the clustering results, the diversity of urban birds showed 10 types of "regional type", with spatial correspondence to the seven bird geographic regions in China. The natural environmental factors in the area where the cities were located were the dominant factors causing bird species replacement among cities, while intra-city environmental conditions, such as plant abundance, were important causes of differences in bird richness among cities. Accordingly, a multi-scale and multi-level conservation system of "regional-urban-greenland" was proposed. At the regional scale, attention should be paid to the differences in the diversity characteristics of various types of birds. The urban scale mainly focused on the diffusion relationship between urban bird groups and surrounding natural groups, while the green space scale focused on the creation of habitats such as plant diversity within the upper strategic framework. This study can contribute to a deeper understanding of the overall characteristics of urban bird diversity in China, and can provide useful references for the construction of urban green spaces guided by bird diversity conservation.