Abstract: Forward modeling illustreates that the shape and filling velocity of the seabed reef cause the overall pulling of the underlying seismic events. In the case of the velocity of the reef being unsure, four different models of velocity were chosen to correct the structure during interpretation. With the increase in the filling velocity of the reef, the amplitude and the area of the structure decrease, and even disappear. Therefore, the determination of velocity and thickness of the seabed reef is important in seimic interpretation in order to provide the believable exploration target and to reduce the risk of exploration.