Don't be depressed because you don't understand the problem, please come to Shitong! Words, charts, drawings, etc. written on paper using the smart pen can be viewed and stored on the LCD screen in real time through the Shitong application installed in the mobile phone. The subtle action of the smart pen is also detected in real time, according to the time. The changes in real time synchronize the changed picture and audio, and are stored as video files, so that the stored video files can be shared to registered friends in time through chat rooms and bulletin boards. The meeting of teachers and students is the beginning of learning.