The development trend of touch screen technology is characterized by specialization, multimedia, three-dimensional and large screen. With the development of the information society, people need to obtain a variety of public information, use the touch screen technology as the public information transmission system of the interactive window, and use advanced computer technologies to use text, images, music, commentary, animation, video, etc. Various forms of information are introduced to people in an intuitive and vivid manner, bringing great convenience to people. We believe that with the rapid development of technology, touch screens will play an important role in the popularization of computer technology. Entering the touch screen but inputting the full keyboard, the touch screen has no physical keys. The reason is that the input method needs to locate the position of the finger. For example, when the two hands are used to operate the computer keyboard, the designated position in the left index finger is at the F key, and the designated position at the right hand is at J. The keys, but the touch screen can not be positioned like the bumps or the input sense of the keys, and it is difficult to form an efficient blind touch.