A thermodynamic model including four irreversiblilities is used to investigate the optimal Performance a solar-driven thermoelectric generator. The efficiency of the system is derived and taken as and objective function for optimiztion. Some important curves, such as the efficiency of the system versus the operating temperature of the solar collector, the reduced current, and the load resistance, are obtained. These curves can reveal the performance charaterisistics of solar-driven thermoelectric generators. the maximum efficeiency of the system and the corresponding reduced current are derived for some special cases. The optimal matching of load resistance which is one of the kdy problems in the optimal design of solar-driven thermoelectric generators is discussed. New bounds of the key performance parameters, such as the efficiency, power output, and load resistance, are determined.