Abstract：Based on the result of 2-D field experiments, the paper analyzed and discussed 2-D ordinary geometry and flexi-bin geometry and further analyzed 3-D flexi-bin geometry, which got following conclusions: flexi-bin geometry may result in violently skipping variation in minimum offset, azimuth and even spatial wavefield of adjacent bins; the more the flexi-bins, the bigger the skip and the sudden change that have more significant influence on seismic data. The similar conclusions are also true for 3-D flexi-bin geometry,so that when designing the flexi-bin geometry,it should not only pay attention to the attributes of bin itself (including uniform distribution of offset and azimuth),but also consider the variation between adjacent bins and take relevant measures such as shorten of intervals of receiving lines and shot lines, which do our best to reduce the spatial variation. Generally,it had better do half-division for 2-D geometry and quarter-division for 3-D geometry.
