Abstract: On the seismic data acquisition project before,the strings should be equal and parallel to the source line. And there are geophones that the distance is the same in each line. The interval between sources lines is integral multiple of trace interval. The interval of receiving lines is integral multiple of shot interval. Shoot shots using this kind of system,in theory,there will be only on CMP in each normal surface. But if we change the shot interval,the trace interval,the group interval and the interval of receiving lines and make the geophone and source to be superposition after each or group points,then the number of CMP in each normal surface will increase multiply. When it is being processed,the exploration staff can make adjustment of surface and make the perfect choice between the fold number and the resolution rate ac-cording to the practice.