Smartphone life provides great convenience for people, it is very common essentials, it is a symbol of fashion, and also a symbol of identity. Therefore, reasonably choosing and buying a smartphone is very necessary for college students. In this paper, we use the analytic hierarchy process (ahp) to buy smartphones college students conducted in-depth research. It establishes the hierarchical model, from the performance, price, appearance of mobile phones, according to the level 9 scaling analysis of mobile factors in detail. The root method computing for a variety of factors is used. It sorts and selects the optimal solution, in preparation for college students to provide some references to buy mobile phones.