Hydrogen is produced thermochemically from water at temperatures below 500 degrees C by feeding water vapour to the glass side surface of tungsten phosphate glass thick film/Pd laminated membrane and extracting selectively the hydrogen dissolved and diffused into the membrane from the opposite Pd side surface. The characteristics of the process are to be suitable for onsite production because of low temperature reactions and to be a simple membrane type reaction system with small process number but including automatic separation and purifying process of the generated hydrogen. Although a lot of relating technologies must be developed in order to find a way to practical use, the scientific basis of the hydrogen production was established. (c) 2006 Published by Elsevier B.V.