▎ 摘　　要

In this study, a graphene oxide (GO) functionalized organic-inorganic hybrid was prepared by covalently immobilization of organic (3-aminopropyltrimethoxysilane) and inorganic (H3PMo12O40) groups on the basal plane of GO. Structure of catalyst was characterized with different analysis such as FT-IR, SEM, TEM, EDS, WDX, XRD, and TGA. All analyses approve the successful covalently immobilization of organic and inorganic parts on the GO. The activity of catalyst has been tested for the synthesis of tetrahydrobenzo[b]pyran derivatives under solvent-free condition in short reaction time and good to excellent yields. [GRAPHICS]