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The lakeshore line��deep lake line and bottom configuration restoration of lake basin in Yanchang Formation show the evolvement characteristics of lake basin migrating to the southwest and then to the northeast. The lake basin of the Member Change 6 is characterized by steeping in south and west��and slowing in north and east. The center of basin locates in the north of Miaowan��the east of Zhengning and the south of Ganquan��which leads to gentle slope delta system in northeast��abrupt slope braided-delta in southwest��and turbidite fan in front end of braided-delta. Yanchang Formation can be divided into five sequences in third-level and controlled the distribution of four source-reservoir-cap units. Lake basin evolution of Yanchang Formation shows intimate accumulation with petroleum��and the delta front near lakeshore line is the main petroleum abundance zone��while the turbidite sandbody in deep lake also has certain reservoir capability and good accumulation condition. The characteristics of main accumulation combination and turbidite in deep lake in northeast and southwest show the possibility of further exploration forward basin hinterland.