Abstract: Based on the existing problems of the construction materials laboratory course at present, using the virtual experiment assisted the teaching supplement, replacing the traditional experimental teaching. On the basis of summarizing the domestic and foreign literatures, this paper elaborates the design ideas of the virtual laboratory of building materials, the composition and function of the laboratory platform. The advantages of virtual assistant experiment teaching are analyzed. Namely, the use of virtual experiment teaching can improve the students' ability of experiment design, enrich the experimental content, enhance learning interest and shorten the experiment time. At the same time, it is also of great significance to improve the students' practical ability and improve the efficiency of experiment course.