Abstract: Taking the solar thermal power station with thermal energy storage built at Daggett area in USA as a calculation model,energy,exergy and general exergy analysis were carried out on the parabolic trough solar thermal power generation system. The calculated results indicate that energy efficiency,exergy efficiency and universal exergy utilization factor of the system at the optimal economic point are 13.1%,14.0% and 8.6%,respectively. At the same time, energy efficiency,exergy efficiency and universal exergy utilization factor of each subsystem of the solar thermal power system are also obtained. Research results reveal that the vulnerable spots of energy utilization,exergy utilization and resource utilization process of the system are respectively heat exchanging power generation subsystem,concentrated light collection subsystem and thermal energy storage subsystem. At last,the influence of solar field area,thermal energy storage cost,geometric concentration ratio and loan rate on the energy efficiency,exergy efficiency and universal exergy utilization factor is analyzed.