Abstract: Contradictory space is a basic content of art design course,and a special method for the creative works.Understanding the principle of contradictory space is the key to apply it well.It is not easy to understand contradictory space for students in the traditional demonstration-based teaching.This paper emphasizes the necessity of improving the contradictory space teaching,and explores the best way for the demonstration.In conclusion,a digital 3D interactive teaching system built by Unity3D virtual reality technology can effectively improve the demonstration,which shows quite positive significances in art design teaching.With real cases,this paper also illustrates the system's structural design and the technical implementation,etc.