Abstract: In the teaching of construction technology of urban underground engineering, image spatial representation and teaching demonstration tools are needed when it involves unusual architectural space and the construction process which is difficult to express. BIM can provide excellent information communication and expression ability and can be applied to the teaching practice of construction technology of urban underground engineering. Urban underground engineering components are classified and viewed effectively by embedding Unity3D engine to Winform; urban underground space roaming program has been developed by Navisworks API, which realizes virtual space roaming under the gravity. And a demo player for construction process is developed. The conclusion has certain significance on the teaching of construction technology of urban underground engineering.