As the development of broadband and online communication move on, mobile learning gradually becomes an important mode for learning. With the use of smart phone surfing on the Internet, students could acquire knowledge anytime, anywhere. Students can even link to the teaching websites just by scanning the QR codes near the exercises on their textbooks with their cell phones. Later on the images of instruction will be shown on the screen of smart phones. This learning mode not only assists teachers’ instructions but also benefits students’ learning. Therefore this study adopts the subject "QR codes applied to the teaching processes of vocational high school math courses" as the main topic so as to make math teaching more interesting.