The study on sedimentary facies and sedimentary system are very important parts of the research of reservoir. In this paper,based on the reservoir in the Dainan-Sanduo formation of Zhenwu oilfield with high thickness and long sedimentary history, variable sedimentation type, and on the research of the depositional setting and provenance, we set up 5 kinds of sedimentary facies which are the anastomosed stream, meandering river, delta, fan-delta and abrupt-fan. After the research of the thickness of the reservoir and the rule of the size grade, the characteristic of provenance in the work area is in two directions and with three provenances. The south and north are both the direction of the provenance, and the south provenance has two parts, one is from the southeast, and the other is from southwest. In the sedimentary evolution of the Dainan-Sanduo formation in Zhenwu oilfield, the south and north provenances controlled the variable sedimentary facies and the sedimentary evolution model, and the transformation of the south and north provenances controlled the sedimentary characteristics, so we set up the transformation style sedimentary evolution model of the Zhenwu oilfield, and it supplies the new method for the analysis of the reservoir origin and distribution.