Graduation design plays a very important role in cultivating the ability of building electricity and intelligence students to comprehensively use the basic theory, basic knowledge, basic skills and solve practical problems. Multi-school graduation design can not only promote the communication between universities, but also strengthen the construction of a major and expand its influence. Based on the analysis of the eight-year practice of teaching mode of joint graduation design of building electricity and intelligence, this paper discusses the interactive teaching practice among colleges and enterprises, and puts forward corresponding suggestions for the existing problems, so as to promote the mutual benefit between teachers and students, implement the concept of sharing educational resources, realize the mutual benefit and win-win situation of multiple institutions, and promote the innovation of multi-dimensional practice teaching mode of collaborative education.