Polymer brushes, polymers tethering one end of a surface, are powerful materials for tailoring the surface functionality and morphology towards a wide variety of applications ranging from optical and electronic devices to stem cell researches.In contrast to the 1D and 2D patterns,the fabrication and engineering of well-defined 3D structures of polymer brushes are still in the early stage of development because of the remarkable complexity in simultaneous alignment of the in-plane lateral spacing and the out-of-plane height.