Abstract:Decoupled numerical simulation technique of near-field wave motion can truly reflect characters of ground motion propagation in infinite domain, and becomes one of important methods. It is difficult to construct complex geotechnical profile and it is slowly and complicated to show the result for function of existing main program is correspondingly simple, which is quite inconvenient used in scientific research and practical engineering. As a result, Based on VB6.0(Visual Basic 6.0) language designing GUI and programming of mixed language, an idea on taking advantage of existing software, such as ANSYS, Surfer and Fortran program, to explore a visual system, including, firstly, VB shell function controlling Fortran executable file to create simplify model and ANSYS8.0 building complicated irregular engineering geological model by prepared batch file at the preprocess part. then, enhanced the main Fortran program with dynamic array storage and release, breaking and resetting freely, multiplicate actions analysis in coupling field, and calculating the model with unequal height in left and right etc. lastly, In the post-process, The system is combined with Surfer8.0 with no sew by ActiveX automation agreement, 3D romance figures come true, and customized 2D figure is carried out in VB language. 2D numerical model of retaining wall-soil system with a railway is studied when both a train passed by and earthquake happened, the case study shows that more powerful function, friendly interface, fastness and convenience, can be realized. The procedure gives an example of developing new software with the advantages of different programs on distinct development flat. And a technical path is proposed for more application of wave motion FEM in complicated geological engineering.