Abstract: This paper introduces the evolution of the user development and its major methods of using the user development platform based on the characterization construction drawings and the feasibility and practical needs of automatic drafting. The details of VBA based plug-in environment are also presented. Procedures that can automatically draft the construction drawings for the deep excavation are provided: instructions of the AutoCAD objects, performance functions and properties; VBA operation with Word and Excel files that can automatically read the design calculations and data from the user defined excel files. The automatically drafting procedures were satisfactorily applied in a deep excavation design project. 

Key words: AutoCAD, user development, VBA programming, deep excavations, automatic drafting