The rapid promotion of smart phones and the update of communication technology has brought great changes to people's lives, and the online service functions of telecom operators' APP are becoming increasingly rich. The usability and availability of APP are directly related to users' evaluation of the service quality of businesses. Businesses can also improve their market competitiveness by improving APP availability. In this paper, eye movement experiment and questionnaire analysis were used to compare the usability of Telecom and China Unicom operator APPs. It was found that China Unicom APP has obvious icon characteristics and strong usability than Telecom APP. Compared with Unicom APP, Telecom APP has reasonable page layout, simple interface and is easy to search. Experiments showed that telecom operator APPs has obvious functional icon characteristics, simple and easy to search interface, and orderly interface clues, which can improve usability.