Abstract: Auto CAD redevelopment based on VBA and the actualization of three-dimensional solid topography is of widely practicability in engineering survey. Three-dimensional solid topography takes place of the traditional quantities calculation method, it’s fast and accurate. This software goes to a deeper level in aspects such as auxiliary design and decision-making assistant. This paper introduced the main functions of Auto CAD applied in large-scale topography drawing procedure, application, prospect analysis and et al.