The full name of two-dimensional material is two-dimensional atomic crystal material. It refers to the material in which electrons can only move freely on the non nano scale of two dimensions. It is a new thing with the successful separation of single atomic layer graphene. There are many kinds of two-dimensional materials, including conductors (such as graphene), semiconductors (such as transition metal chalcogenide two-dimensional materials, indium selenide, etc.) and insulators (such as hexagonal boron nitride). Two dimensional materials have the characteristics of conductivity, heat conduction, optics and chemistry that materials do not have in the macro scale. Therefore, field effect transistors, photoelectric devices, thermoelectric devices and other fields have broad application prospects, and have triggered a wave of scientific and technological competition in many fields such as global academia, new materials, electronic semiconductors and so on.