Large amounts of anthropogenic CO2 emissions asso-ciated with increased fossil fuel consumption have led to global warming.Upgrading CO2 and water into solar fuels such as hydrogen,methanol,ethanol,etc.,is believed to be one of the best methods to address this serious problem.Herein,we focus on introducing our endeavor of developing the photoelectrochemical water splitting reaction system,constructing the(photo)electrochemical CO2 reduction reaction sys-tem,and realizing the artificial leaves.This paper consists of a brief introduction,representative appli-cations,and related mechanisms.These research results would be helpful to achieve sustainable de-velopment in our society based on the use of solar energy.