Abstract: In order to investigate the improvement of the UV absorption properties of polyester fabrics with UV-absorbers, 5 UV absorbers with the structure of benzotriazole were dispersed and then applied onto polyester fabrics in high pressure dyeing method. The uptake of the UV-absorbers on polyester fabric and the transmittance of UV radiation through fabrics were measured. The results showed the UV absorbers selected could be taken up onto polyester fabrics by exhaustion dyeing at 130℃ for 40—60min. The uptakes of UV absorbers onto polyester fabrics were influenced by the structure, molecular weight of the UV absorbers, dyeing temperature and amount of UV absorbers applied as well. The UV absorbers with suitable molecular weight more aromatic groups and greater ratio of hydrophobic group in molecule could have greater uptakes. The UV absorbers with greater uptakes could improve the UV absorption properties more significantly. The UV absorber which had lower uptake but with double chelation ring of hydrogen bond within the molecule could also improve the UV absorption ability obviously.