We test the usability of the app in the mobile phone business hall of China Mobile and China Unicom through experiments. We use interview, usability measurement questionnaire and eye tracking technology to test the usability of the two apps from both subjective and objective sides, so as to find out the problems and improvement of expectations encountered by users during the use process. We analyzed the data collected from the experiment and evaluated the usability of the two apps. Finally, we proposed some improvement schemes and designed the improved interaction prototype. Welcome to criticize and correct the teachers and students.