Soil bacteria, as an important part of soil microorganisms, play an important role in soil ecosystem. As a typical forest vegetation type in northern subtropical region, Pinus massoniana coniferous and broad-leaved mixed forest plays an important role in regional zonal vegetation restoration. Explore the composition structure and diversity characteristics of soil bacterial communities in different types of forests is the key to maintain the health and stability of P. massoniana forest ecosystem. In this study, four forest types of Pinus massoniana (the pure forest of Pinus massoniana (PF), Pinus massoniana-Quercus acutissima mixed forest (PQM), Pinus massoniana and Liquidambar formosana mixed forest (PLM) and Pinus massoniana-Platycarya strobilacea (PPM)) were selected from the Dabie Mountains of northern subtropical region as the research objects. To analyze the composition and diversity of soil bacterial communities in four P. massoniana forest types under different slope aspects (shady slope and sunny slope), so as to provide the theoretical reference for the production management and soil biodiversity protection of P. massoniana forest under different environmental gradients in this region. The results showed that: (1) Actinobacteria, Proteobacteria, Acidobacteria and Chloroflexi were the dominant bacteria in the soil in four different forest types of