Abstract: Based on the studies into existing highway tunnel CAD design software, and the requirements from practical highway tunnel design, some new solutions for CAD design software is presented. Firstly, to combine parametric based design and interactive design together in modeling and drawing. Secondly, to integrate the three subsystems together, which are structure calculation, structure optimization and construction drawings automatically generating. These solutions are applied in a highway tunnel design software and proved right. The software is developed on GeoFBA2D platform, and provides following features: parametric drawing and interactive drawing, updating drawing right on modification of parameters, FEM calculating considering construction stage, provides several optimizing algorithms and visual drawing management. Highway tunnel design, calculating, optimization and drawing can be completed in a integrated environment, so that highway tunnel design can be more efficiently.