采用ＳＦ６、Ｏ２和空气低温等离子体对双轴拉伸聚丙烯（ＢＯＰＰ）薄膜进行表面改性，考察了表面接技对驻极性能的影响。表面电位被用作表征电荷贮存容量的参数，而热刺激电荷衰减（ＴＳＣＤ）的半值温度（Ｔ１／２）则是衡量电荷贮存稳定性的标志。实验结果显示，氟元素表面接枝可提高电荷贮存容量５０％并使Ｔ１／２增加２５℃。文中还利用红外光谱揭示了处理过程中化学结构的变化，特别是Ｃ－Ｆ、Ｃ＝Ｏ等极性键的引入，最后化学结构与陷阱密度及改性效果之间的关系。 Surface modification of biaxially oriented polypropylene (BOPP) films was carried out using SF6, O2 and air plasma at low temperature. The effects of surface coating on the electret properties were investigated. The surface potential is used as a parameter to characterize the charge storage capacity, and the half-value temperature (T1 / 2) of TSCD is a measure of charge storage stability. The experimental results show that the surface grafting of fluorine can increase the charge storage capacity by 50% and increase T1 / 2 by 25 ℃. Infrared spectroscopy is also used to reveal the chemical structure changes during the treatment, especially the introduction of polar bonds such as C-F and C = O. Finally, the relationship between the chemical structure and trap density and the modification effect is also discussed.