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采用硅烷偶联剂KH550对纳米ZnO颗粒表面进行预处理，将表面处理后的纳米ZnO颗粒与低密度聚乙烯(LDPE)粉末充分混合并热压成型，制得低密度聚乙烯/氧化锌纳米复合薄膜。通过电晕充电法向纳米复合薄膜试样注入表面电荷，研究电晕电压极性和幅值对纳米复合薄膜表面电位衰减特性的影响。结果表明：纳米ZnO颗粒的引入对LDPE纳米复合薄膜的归一化表面电位衰减特性产生显著影响，纳米颗粒的添加使聚合物表面电荷的消散速度加快，且相同条件下纳米颗粒的质量分数越高，表面电位衰减速度越快。同时纳米复合薄膜的归一化表面电位衰减特性与电晕电压极性和幅值均有关，同种试样经正极性电晕充电后可获得更大的归一化表面电位衰减稳态值；充电电压幅值越高，试样的归一化表面电位衰减速度越快。

ZnO nanoparticles were modified by silane coupling agent KH550, and a low-density polyethyl-ene (LDPE)/ZnO nano-composite film was prepared by mixing and molding from the modified ZnO and LDPE. The nano-composite film was charged through corona charging method, and the effect of polarity and amplitude of corona voltage on the surface potential decay characteristic of the LDPE/ZnO nano-com-posite films were investigated. The results show that the addition of ZnO nanoparticles has significant influence on the normalized surface potential decay characteristic of the nano-composite films. The nanoparticles can make the surface charge decay rate accelerate. Moreover, the higher the nanoparticles content, the faster the normalized surface potential decay rate. Meanwhile, the normalized surface poten-tial decay characteristics are related to the polarity and amplitude of corona voltage. For the same kind sample, when the polarity of corona voltage is positive, the sample could obtain higher steady state value of normalized surface potential. The higher the amplitude of corona voltage, the faster the normal-ized surface potential decay rate of the sample is.