A research team from CAS Ningbo Institute of Materials and Institute of Physics has proposed a new method of using lunar soil to produce a large amount of water by studying the hydrogen content of different minerals. H₂O formation could be achieved via endogenous reactions in lunar regolith (LR), specifically through the reaction FeO/Fe₂O₃ + H → Fe + H₂O. This process was demonstrated using LR samples brought back by the Chang’E-5 mission. FeO and Fe₂O₃ are lunar minerals containing Fe oxides. Hydrogen (H) retained in lunar minerals from the solar wind can be used to produce water. The results of this study revealed that 51–76 mg of H₂O can be generated from 1 g of LR after melting at temperatures above 1200 K. This amount is ∼10,000 times the naturally occurring hydroxyl (OH) and H₂O on the Moon. Among the five primary minerals in LR returned by the Chang’E-5 mission, FeTiO₃ ilmenite contains the highest amount of H, owing to its unique lattice structure with sub-nanometer tunnels. In situ heating experiments using a transmission electron microscope revealed the concurrent formation of Fe crystals and H₂O bubbles.