For the purpose of studying the characteristics of braided deltaic reservoirs that are widely developed in the western basins of China, we take the braided deltaic reservoir in Cainan oilfield, Junggar Basin as an example to analyze the mineral character, pore structure, and physical property of reservoir in this area. After researching the detrital component, clay mineral, grain psephicity, and grain selection, we analyze the mineral character of this reservoir, and find that the main lithologies are lithic sandstone and feldspar lithic sandstone. The unstable components (feldspar and debris) in the detrital components are high, and compositional maturity is low. We also utilize the average value of pore radius, average pore throat ratio, pore coordination number, pore uniformity coefficient, average throats width and replacement pressure to study the pore character, and the result shows that the pore character of the braided deltaic reservoir is moderate. In the analysis of the physical property, we find the porosity and permeability are changed greatly, and the reservoir of this kind is characterized by moderate porosity and permeability. In summary, the braided delta reservoir is a kind of moderate reservoir, and it is able to form good hydrocarbon reservoir.