This work is based on the theme of "learning Chinese with Chinese characters and promoting Chinese language and culture". It is an AR virtual interactive work called "between the lines" based on Android, developed by Unity game engine combined with maya, Adobe photoshop, Adobe Illustrator and other software. Users can touch the screen, click on the screen, voice input and other basic operations on Android mobile phones. The works have various interaction modes, including AR recognition, virtual buttons, scene roaming, voice recognition input, Chinese character font conversion, and calligraphy simulation exercises. Combining AR recognition, Chinese character puzzle, calligraphy simulation exercises and other functions with Chinese language knowledge, while expressing the beauty of Chinese characters and promoting Chinese language and culture, it can be used as an auxiliary product for teaching Chinese character culture. Under the epidemic situation, AR Android APP provides users with a convenient and safe form of cultural communication. The purpose of the work is to enable the excellent traditional culture of Chinese characters to communicate and interact with users in a variety of forms, and to spread Chinese characters, Chinese language and cultural knowledge to the audience more conveniently and quickly in the form of Android operation, so as to show the breadth and depth of Chinese culture between the lines.