We are focusing on the construction and functionalization of two-dimensional functional materials.Two-dimensional single-layered covalent organic framework (2D sCOF) is a typical class of graphene-like monolayer.Scientists are dedicated to the synthesis of 2D sCOF to prepare two graphehe-like materials with novel electronics, sensing, catalysis and so on.We have explored the preparation of 2D sCOF based on Schiff base reaction.