Abstract：In ordinary field 3-D layout，receiving-line spacing is n-times the seismic source gap，and source-line spacing is n-times the receiver interval;as a result，at each intersecting point of source line and receiving line，source position superposes receiver position. Theoretically，such layout makes each CMP lie at the center ofcorresponding reflection bin.Bin-divisible field layout is simple in its geometry structure，and favours field operation. The source-line spacing is the non-integral times of group interval，and the receiving-line spacing is not the integral times of source gap. The remainder after the ratio of receiving-line spacing to source-line spacing determines the expected sub-bins in directions of receiving line or source line. Common-mid points lie uniformly in a common reflection bin，which is divisible. Seismic data processors may choose proper bin size according to different geology tasks， increasing the options in seismic data processing and interpretation. Common reflection bin contains more seismic informations coming from different common-mid points，therefore both the variation and local anomaly of subsurface geological structure may be highlighted very obviously.
