The relationship between the structure and morphology of the catalytic material and its photochemical catalytic performance was studied at the molecular level, and the new inorganic semiconductor nanomaterial combining the hydrothermal synthesis process and theoretical prediction was carried out to study its photocatalytic hydrogen production performance. An efficient, stable and low-cost solar photovoltaic chemical water decomposition device is studied. A new type of visible light response composite photocatalyst with high selectivity and recognizability modified by surface molecular imprinting was studied. The multivariate composite oxides, nitride light catalyst system, explore the controllable synthesis and multivariate composite photocatalyst synergy, and separation with harmful pollutants in the environment as the goal, study of multivariate composite photocatalyst to target catalytic degradation of pollutants and separation effect, the effects of catalyst particle composition, morphology and separation of the composite way on environmental pollutants degradation effect. The technology of CO2 reduction by photocatalysis was studied, and the reactor of CO2 conversion by photocatalysis and the design of CO2 composite photocatalytic materials were explored. The coupling mechanism of different photocatalyst materials was studied and the universality and uniqueness of composite photocatalyst combinations were explored.