There have been disputes about the diapiric dynamic mechanism and the main controlling factors for the formation of the shaped fault in the Xinzhen structural belt of the Dongying Depression. This paper, analyzing theSfineStectonics of seismic data and combining with the characteristics of stratigraphic assemblage, designed the physical modeling with plastic layer to physically simulate tectonicSandSsedimentary evolution of the XinZhen structural belt. According to the geological characteristics of the Xinzhen structural belt and the results of physical modeling, this paper analyzed the dynamic mechanism of the diapir structure, and discussed the deformation characteristics of the plastic layer under the extensional tectonic background and its interaction with the overlying strata. Some conclusions have been reached: (1) Under the extensional tectonic setting of the basin, the activity of slope-flat basement faults results in the topographic fluctuation of the strata in the upper wall, and the diapir is triggered by differential subsidence induced by later syntectonicSsedimentation. (2) The "cabbage" shaped fault in the Xinzhen structural belt is the result of diapir and regional extension, and the plastic layer provides a good detachment layer for fault development.