The Chunfeng Oilfield is locates in the northeast of the Chepaizi Uplift, the western margin of the Junggar Basin, the main Sedimentary microfacies are fan detla front underwater distributary channel and braided river delta front underwater distributary channel. Base on the contrast of stratigraphic subdivision and the research of sedimentary microfacies, through observing the core, thin sections, combined with the experimental datas of scanning electron microscopy, X-difraction analysis and mercury curve, carried out the research of the reservoir characteristics and the main controlling factors of N1s11 layer in Chunfeng Oilfield. The results show that N1s11 brown conglomeratic sandstone reservoirs are mainly identified lithic arkose, the layer from bottom to top presents three layers structure: the basal conglomerate grit, conglomeratic sandstone and fine sandstone, fine sandstone and argillaceous siltstone. Reservoir spaces are mainly primary intergranular pore, large pore coarse throat type and large pore medium throat type are the main pore structures for storing oil and gas. carbonate cementation, which is common and the carbonate content under different wells and phases are different, is the main control factor of reservoir property.