▎ 摘　　要

NOVELTY - A composite substrate comprises single graphene layer and metal nano array layer. USE - Composite substrate used for optoelectronic component and thin film solar battery. ADVANTAGE - The method has simple operation and cheap raw materials. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite substrate comprising performing liquid level self-assembly method for preparing nanosphere mask, vacuum film coating, removing nanosphere mask plate to obtain metal nano array, performing chemical-mechanical polishing, carrying out chemical vapor deposition, coating with adhesive layer on metal substrate, etching, washing, drying and removing photoresist layer.