Bozi 7 reservoir is an oil-producing reservoir discovered in Kuqa Depression, Tarim Basin. The oil producing formation is the Cretaceous Bashjiqike Formation, with a depth of over than 7000 m. Using core, thin section, logging, seismic and production data, the geological characteristics of Bozi 7 reservoir are analyzed, and the hydrocarbon charging characteristics and reservoir forming conditions are discussed. The reservoir rocks of Bozi 7 are dominated by fine-medium grained lithic arkose, with average porosity and permeability of 8.7% and 1.2 mD respectively. The fractures are relatively developed and basically unfilled. The pressure coefficient of the reservoir is 1.85, showing abnormal high-pressure characteristics. The production gas/oil ratio is 409 m³/m³. The oil density is 0.8 g/cm³ with low viscosity and high wax content and natural gas has a low methane content. The hydrocarbon mainly comes from Jurassic source rock. The Kuqa depression has mainly experienced 3 stages of hydrocarbon charging, and the hydrocarbon of Bozi 7 reservoir mainly comes from the second stage. Large thrust faults and their derived secondary faults provide pathways for oil/gas migration, while fracture networks promote hydrocarbon charging. High-quality reservoir-seal combinations provide favorable conditions for oil/gas preservation. Experienced rapid charging and accumulation in the later stage, the Bozi 7 hydrocarbon reservoir is formed.