Abstract：On the basis of research of the former,the paper deduce a method that can map for interpretation both working in workstation and by hand and both has no mistake on theory and is easy to use in operation.The basic points of the method are:①vertical and horizontal section are used,there are no any data to be abandoned;②it can directly use t0=2H/Va to calibrate horiaon on migration section and needn't correct for horiaontal layer,crest or low point of structure and dipping bed;③combination of ordinary comparative interpretation and non-isochronic comparative interpretation to interpret section;.the tie problem of t0 value at cross-point on map can be solved by backward migration along line and mapping of isochronic t0 and isobath(also can directly map isobath without mapping of isochronic t0).
