As high-octane fuel additives, biomass-derived furfuryl ethers (FE) can significantly enhance fuel efficiency.In the conventional production of FE from furfuryl alc. (FA), the strong acid sites in Al-zeolites often cause severe ring-opening of the target product FE.Therefore, it is highly desired to design solid acids that can efficiently catalyze the FA etherification while preventing FE decompositionHerein, we demonstrate that germanosilicates (Ge-zeolites) exhibit superior target FE yield compared with conventional Al-zeolites and Ti-zeolites.Benefitting from the special germanium-enriched double-four-membered-ring (D4R) building units, Ge-zeolites (Si/Ge = 3-10, UOV, BEC, and -IRT) possess abundant acid sites with suitable strength and excellent diffusion ability.Ge-zeolites in UOV, BEC, and -IRT topol. exhibit FEE yields of 85.3 %, 89.8 %, and 75.6 % after reaction for 60, 15, and 5 min under the reaction conditions investigated, resp.The d. functional theory (DFT) simulations confirm that the energy barrier of the ring-opening of FEE over Ge atoms within these zeolites is much higher than that over the Al atoms in traditional Al-zeolites.The inherent extra-large pore channel of Ge-zeolites also minimizes intrapore diffusion constraints, greatly improving the accessibility of active sites and the rapid diffusion of products.Moreover, the Ge-zeolites exhibit certain structural stability in alc. solvent systems, resulting in good recyclability and practical application.