Through the analysis of depositional environment, core facies and electrofacies, it is concluded that piedmont pluvial facies were developed during the deposition of the Lower Karamay Formation. On the basis of this area, four subfacies were divided (the inner belt of root fan, the outer belt of root fan, middle fan and fan edge). Based on the piedmont pluvial facies, eight microfacies were divided (the gravel of channel flow, the gravel of laminar flow, sheetflood sand, sheetflood fine grain, braided channel, runoff channel, overflow sand and overflow fine grain). And the characteristics of petrology, construction, structure and electric were described. The distribution of facies in plane and certical evolution were indicated, and the sedimentary model of the area was established.

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