The arrival of the "Internet plus" era has put forward new requirements for the theoretical courses of art design majors in colleges and universities. This paper analyzes the teaching mode of theoretical courses of art design specialty in the era of "Internet plus” and puts forward new reform strategies. Systematically summarize the problems existing in the teaching of commercial illustration, improve and optimize the teaching methods based on Internet information technology, and explore the teaching reform mainly from four aspects: national art, information teaching, two-dimensional code, and self-packaging, so as to improve the quality of teaching and obtain the best teaching effect.