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We investigate the effects of ultraviolet (UV) irradiation treatment with varying irradiation intensities for different treatment times of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) film on the performance and stability of polymer solar cells (PSCs) based on regioregular poly(3-hexylthiophene) (P3HT) and methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) blend.Ultraviolet-visible transmission spectra,x-ray photoelectron spectroscopy,contact angle measurement,atomic force microscopy and the Kelvin probe method are conducted to characterize the UV-treated PEDOT:PSS film.The results demonstrate that UV treatment can improve the power conversion efficiency (PCE) and stability of PSCs effectively.The best performance is achieved under 1200μW/cm2 UV treatment for 50min.Compared to the control device,the optimized device exhibits enhanced performance with a Voc of 0.59 V,Jsc of 12.3 mA/cm2,fill factor of 51％,and PCE of 3.64％,increased by 3.5％,33％,8.7％ and 50％,respectively.The stability of the PSCs is enhanced by 2.5 times simply through the UV treatment on the PEDOT:PSS buffer layer.The improvement in the device performance and stability is attributed to the improvement in the wettability property and the increase in the work function of the PEDOT:PSS film by UV treatment,while the impact of UV treatment on the transparency of the PEDOT:PSS film is negligible.The strategy of using UV treatment to improve device performance and stability is attractive due to its simplicity,cost-effectiveness,and because it is suitable for large-scale commercial production.