▎ 摘　　要

NOVELTY - Graphene paper capable of continuously controlling water wettability, prepared by laser-induced reduction of polyimide paper, is claimed. The laser-induced scanning speed is 25.4-101.6 mm/s, the power is 1-3 W, and the focal length is 33.1-35.1 mm, and the contact angle of the graphene paper capable of continuously controlling water wettability to water is 0-155 degrees . USE - The graphene paper useful in preparing adjustable surface soakage device and in cell directional culture or compound directional crystallization and as the material for liquid the reverse gravity (all claimed). ADVANTAGE - The grapheme paper has simple preparation method.