Abstract：In the first place，full acoustic-wave equation is decomposed into two one-way side axis equations which are respectively applied to forward modeling and migration. Then，common-shot seismograms will be synthesized with the use of one-way equation applicable to forward modeling, By formula deducing，we put forward the tithe consistent principle and two processes (positive and inverse processes) for synthesizing common-shot seismograms. In the case of horizontal isotropic layeredmedium，common-shot seismograms can be precisely synthesized only with the use of the positive process. ?n the case of complicated medium，the common-shot seismograms may be synthesized by offering shot point and receiver point with the use of ray two-point problem and wave equation prestack depth migration principle of common-shot seiscr.;.oram，then by adopting the inverse process，on the basis of time consistent principle，to achieve respectively the forward continuation of source wave field and the inverse continuation of receiver wave field with the aid of oneway acoustic wave equation. The method may be evolved into prestack depth migration，zero-offset forward modeling and post-stack depth migration of commonshot seismograms.The results of numerical simulation test show that all methods in the paper have brought the expected effect.
