Abstract: Based on the control point and digital terrain model, the theory of highway alignment design and swarm intelligence algorithms were used to generate highway horizontal, vertical and cross-sectional alignments automatically. And on the basis of the OpenGL and VC++ programming language, the three-dimensional model of highways for driving simulators was presented. Application examples show that the highway intelligent design and road-terrain fusion technology can quickly generate highway and mountainous terrain landscape models precisely. In addition, the models have good versatility and portability.