▎ 摘　　要

NOVELTY - The material is made of water-soluble convert folic acid functional nano-meter particle with graphene oxide, where mass ratio of the convert folic acid functional nano-meter particle is about 1/1 : 1/2. USE - Water-soluble acid convert functionalized nano-particle graphene oxide composite material for use as a biological probe to identify a cancer cell. ADVANTAGE - The material has water-solubility, better stability and better application prospect for cancer diagnosis process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a water-soluble acid convert functionalized nano-particle graphene oxide composite material preparing method. DESCRIPTION OF DRAWING(S) - The drawing shows a graphical view of a graphene oxide composite material.