ADT is a professional software for 3D architectural design developed by Autodesk Company. ADT uses object-oriented technology to establish a set of professional objects that can be used in architectural design, so that designers can effectively establish three-dimensional architectural models and obtain two-dimensional architectural graphics such as plane, elevation and section. ADT is based on AutoCAD and inherits all the styles and features of AutoCAD, including user interface and operation commands. If users don't need to use ADT-specific architecture-related objects and commands, they can use ADT as a simple AutoCAD.