This book systematically explains the basic scientific principles and practical engineering applications of solar photovoltaic and photothermal technologies. The main contents include: basic knowledge about solar energy resources, working principles and development of solar photovoltaic cells, solar photovoltaic power station system design and optimization, solar photothermal power generation principles, optical design of chicken buses, design and optimization of the concentrating part of solar photothermal power stations, various solar energy storage technologies, integrating theory with practice and focusing on applying scientific theories to solve practical engineering problems. This book is not only a textbook for new energy science and engineering majors, but also a reference book for scientific research and engineering technicians engaged in fields related to solar energy utilization technology.