Abstract: In order to improve the efficiency of solar PV/T systems, baffle plates and swirl devices were added to the cooling channels of an air-cooled PV/T system to enhance heat transfer. A numerical model was established, and the influence of air flow resistance was comprehensively considered. The effects of such factors as mass flow rate, number of baffle plates, swirl intensity on the actual electrical efficiency and comprehensive efficiency of PV/T systems were analyzed. Results show that with the increase of the mass flow rate of the cooling air, both electrical efficiency and thermal efficiency gradually increase, but the increase rate decreases. When the mass flow rate increases from 0.01 kg/s to 0.05 kg/s, the electrical efficiency rises by approximately 0.65 percentage rates.The actual electrical efficiency and the actual comprehensive efficiency of the PV/T system first increase and then decrease with the increase of the air mass flow rate. When the air mass flow rate is 0.02 kg/s and 0.04 kg/s, the actual electrical efficiency and the actual comprehensive efficiency reach the maximum values respectively. Adding a swirl fan to the channel chamber can effectively improve the comprehensive efficiency of the system. When the swirl intensity is 3, the overall efficiency of the PV/T system can reach 79.09%. Under the same swirl intensity, the lifting effect of swirl on low inlet mass flow systems is more obvious compared with that under a high mass flow.