It is obvious that the shot density and receiver density are very important to the cost, but the effect of the shot density and receiver density on imagery remains unclear. The authors studied the effect of the shot density and the receiver density on imagery, and reache d the conclusion that the property of the 3-D geometry, rather than the shot density and the receiver density, is important to imagery. It is suggested that we can adjust the shot density and the receiver density to reduce the cost under the condition that the fold and the bin are not changed.