▎ 摘　　要

NOVELTY - A heat-dissipation substrate comprises substrate component and Van der Waals structure layer on substrate component. The Van der Waals structure layer comprises at least two gallium nitride layers and a graphene layer between the two gallium nitride layers. The graphene layer is made of single-layer graphene. USE - Heat-dissipation substrate for gallium nitride-based device. ADVANTAGE - The heat-dissipation substrate has excellent performance and heat dissipation effect compared with existing epitaxial heat-dissipating substrate. The preparation method is economical and suitable for industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the heat-dissipation substrate.