The design concept for this “Children library” is : Tetris. For most children, Tetris is the first game they have come into contact with in memory. This game carries many children’s cognition and fantasy of color and pattern.I will apply the elements of Tetris to the design of the whole children’s library, including furniture, wall painting, lamps and so on. Let the children in the library can not only be constrained to study, but also be immersed in it, let them feel that this is a place to relax and play, and combine learning with entertainment. Let color and graphics collide with more different feelings.