With the rapid development of information technology, new mobile terminals are gradually applied to mobile micro-learning. According to the horizon report issued by NMC, mobile technology has been listed as an important technology with developmental poten_x005ftial and applicable space in the field of education in recent years, which will have a positive impact on both teaching and learning. As an important English for special purpose, business English has the characteristics of professionalism and practicality. It covers a wide range of learning resources and strong effectiveness, which is to a great extent different from traditional English learning. Considering the features of business English and the current situation of business English teaching, this paper discusses the advantages of mobile learning to business English teaching and talks about the popular nanolearning model with the purpose of providing new ideas for optimizing business English teaching.