This paper suggests that in receiver area without shot coverage,such a method can farthest meet the requirement for fine seismic prospecting as increasing shot point by some-interval shooting distance(need to refer to the surface layer thickness) in order to remedy the edge delay time defects in first arrival reflection computation,thus enhancing the accuracy of complex near-surface structural model,eliminating the improper medium-long wave static correction phenomenon caused by the edge effect in seismic data processing.