▎ 摘　　要

NOVELTY - Preparation method of in-situ packaged two-dimensional material comprises (a) forming first two-dimensional material layer by cleavage of a first two-dimensional material on a substrate using a mechanical cleavage method, (b) forming second two-dimensional material layer between the first two-dimensional layer and the substrate, and (c) using a second chemical vapor to vapor deposition to grow the second two-dimensional material layer in situ. USE - Preparation method of in-situ packaged two-dimensional material used in fields of electronics, energy and biomedicine. Uses include but are not limited to graphene, hexagonal boron nitride (hBN), transition metal disulfide compound (TMD) and superconductivity. ADVANTAGE - The method avoids the unstable two-dimensional material is directly exposed to air, has no special restriction to the selection of the substrate, and is stable at high temperature (i.e., stable at 1000?oC) of material. DESCRIPTION OF DRAWING(S) - The drawing shows an optical microscope photograph of a preparation method of in-situ packaged two-dimensional material (Drawing includes non-English language text). 1Sodium chloride particles 2Balance weighing niobium pentaoxide powder 3Graphene