Both point reading machine and point reading pen are electronic products of preschool education. The point reading pen uses the technology of printing two-dimensional code on books to implant sound files into books. Users can choose the page to read and click on the patterns, characters, numbers and other contents on the page at will. The point-reading pen can identify the two-dimensional code on the book through the high-speed camera assembled on the pen head, and read the sound file of the corresponding content, and the recognition accuracy can reach over 99.8%. The use principle of the point reading pen is that in the process of making pronunciation files, the "latitude and longitude position" corresponding to the book content is preset for the pronunciation files. The user puts the textbook on the tablet of the machine, and points the words, pictures, numbers and other contents on the book with a special pen, and the machine will make corresponding sounds. For example, "Watermelon" is on the third page (x, y) from the upper left corner of the primary school language. After selecting this page, the tablet computer will feel the touch of the equipped pen pair (x, y) and receive instructions to read the corresponding sound file, namely "Watermelon".