Abstract: In this paper, a system model of solar driven supercritical water gasification of wheat straw coupled with molten salt energy storage system is presented, which effectively overcomes the intermittency problem of solar energy, thus providing a new carbon neutral path for hydrogen production via biomass gasification. Thermodynamic analysis suggest that pyrolysis temperature and energy input are the main factors affecting the hydrogen yield of the system. The hydrogen yield reached the maximum under the conditions of high pyrolysis temperature（700 ℃） and low energy input（215.14 kW）. Owing to molten salt energy storage, the system could operate continuously throughout the whole day efficiently, with the energy efficiency and exergy efficiency reaching 36.3% and 36%, respectively.