Abstract: According to the energy transfer and conservation process of the high-power concentration photovoltaic photo themal integrated system,the corresponding theoretical model is established,and the thermal performance of the system is evaluated by simulation calculation. On this basis,a high-power concentration photovoltaic phatothermal integrated system experimental platform is built to test and verify the thermal performance under the actual illumination conditions,and the impact of cooling water flow rate is analyzed. The results show that the power generation efficiency of the experimental system is 26.2% and the total energy utilization rate is 75.4%. The theoretical model can approximately evaluate the thermoelectric performance of the system;the open-circuit voltage and short-circuit current of the system are respectively affected by the temperature of cooling water and the intensity of illumination;the cooling water flow rate has a greater impact on the thermoelectric efficiency and the exergy efficiency of the system,so the control strategy of high power concentrating photovoltaic photothermal system should be adjusted according to different needs.