After investigating repeatedly results obtained through gear stress analysis, we make a determination of an optimal gear shape. But its design process was not only complex but also difficult to get a precise profile curve from operating by hand. In this study, relating shape of gear profile curves was generated automatically with standard spur gear, equivalent helical gear, shifted gear & pinion by using developed program which is using Auto_LISP language in Auto-CAD. This program which can design rapidly gear shapes will successfully support gear designing and manufacturing fur Small & Medium companies.