In this work, we explored the possibility to obtain the velocity field and shape of the reflectors in an isotropic layered media using an inverse process. The methodology takes into account the two‐way travel times of the energy that strikes the reflectors of the subsurface and that can be observed at the shot gathers. These times are reproduced with modeling which involves the parameters of the media, the velocity field and the coordinate points (x,y) that define subsurface's reflector; Those parameters will be the objective of a Non linear optimization process. Thismethodology is a more general formulation of that of J. Fawcet and Keller, 1985, because here the latter parameter are the interpretative points that represent the structural form of the interfaces in the model. In our work, as well as in J. Fawcet and Keller, the objective is to find the parameters that minimizes the error between the computed travel times and observed ones; this task is done using a minimum squares technique, specifically the Gauss Newton method and a ray tracing program. This methodology shows to be an effective, fast and accurately way to reach an optimum for the inversed model.