Abstract: Objectives In order to make the small independent power supply unit provide more flexible and stable power supply, a photovoltaic-piezoelectric composite independent power supply system was designed, and its performance in actual operation was analyzed. MethodsConsidering the power supply scenarios such as bus stations,the output characteristics model of piezoelectric ceramics and photovoltaic cells was established, the system configuration of photovoltaic-piezoelectric outdoor independent power supply unit was designed, and the power output and system stability under typical daily, typical annual and long-term operating conditions were analyzed. For the system design with or without piezoelectric ceramics, the reliability rate of power supply, curtailment power and power generation cost of the system were analyzed. Results After adding piezoelectric ceramics, the reliability rate of the system is 99.18%, the power generation cost is 1.399 yuan/（kW·h）, and the annual curtailment power is 161.24 kW·h. Compared with the system without piezoelectric ceramics, the reliability rate is increased by 0.12%, the cost is increased by 0.8%, and the curtailment power is reduced by 18.6%. Conclusions After the addition of piezoelectric ceramics, although the power generation cost of the system increases slightly, the reliability of the system power supply is improved and the curtailment power is reduced. With the reduction of the cost of piezoelectric ceramics and the development of technology, the photovoltaic-piezoelectric composite independent power supply system will have a better application prospect in special scenarios.