▎ 摘　　要

NOVELTY - A hydrogel-forming composition comprises 0.3-1 wt.% graphene oxide and 0.2-1.5 wt.% triblock copolymer (I). USE - Hydrogel-forming composition is useful for forming gel (claimed). ADVANTAGE - The composition exhibits excellent biocompatibility, and is stable for long period of time. DETAILED DESCRIPTION - A hydrogel-forming composition comprises 0.3-1 wt.% graphene oxide and 0.2-1.5 wt.% triblock copolymer of formula: OH-(CH2CH2O)n/2-(CH2CH(-CH3)O)m-(CH2CH2O)n/2-H (I). n=-540;and m=16-70. INDEPENDENT CLAIMS are included for the following: (1) preparation of hydrogel-forming composition; and (2) in vivo method for forming gel, involves administering the above-mentioned hydrogel into a microorganism by giving external stimulus for converting the hydrogel into gel.