Abstract: Hydrogen is widely considered as a clean，efficient and renewable energy. Compared to traditional hydrogen-production technology，solar energy-driven water-splitting combines several attractive features for energy utilization. The energy source and reactive media for solar water-splitting are readily available and are renewable，and the discharge product of H2 utilization is environmentally benign too. A variety of approaches to and technological advances of producing hydrogen，including photovoltaic，indirect or direct thermo-chemical，photo-electrochemical and photo-thermal electrochemical solar water splitting are summarized.