Based on drilling, logging, seismic and chemical analysis data, the Sedimentary facies of the Permian Fengcheng Formation in Kexia area of the Northwest Margin of Junggar Basin is analyzed, It is considered that the Fengfeng Formation was formed under marine regression background, developed fan delta facies, marine facies and volcano clastic facies, and can be further divided into 6 subfacies and 8 microfacies. Among them, fan delta facies are mainly distributed in Kebai area, Xiazijie area mainly developed volcano clastic facies, the bathyal abyssal facies concentrated in Hassan and windy city area, shore shallow marine facies developed in the fan delta wing, the sea has quit in the Fengcheng Formation sedimentary period, the scope of fan delta facies expanded, The eastern region of Hassan area also by the bathyal abyssal facies evolved into fan delta facies, Reflecting Hassan regarded as the boundary between Heshentuoluogai basin and Junggar basin is the result of late tectonic movement.
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