绝缘体真空沿面闪络成为制约脉冲功率技术高电压、大电流和小型化发展应用的主要因素之一。在PTS装置的真空环境中，绝缘材料在受到软X射线辐照的情况下，其绝缘性能受到很大影响。因此为了提高PTS中交联聚苯乙烯的绝缘性能，同时更深刻地认识沿面闪络的机理，通过研究软X射线对于交联聚苯乙烯的辐照作用，观测到了不同辐照次数对于沿面闪络性能的影响。实验表明：未受到辐照的样品其真空沿面闪络性能高于软X射线辐照过的样品，而受14次钨丝阵辐照的样品其真空沿面闪络性能略高于受2次铝丝阵辐照的样品。同时，从软X射线对于绝缘体表面的辐照机理很好地解释了这种实验现象。

Insulator vacuum surface flashover is one of the main factors restricting the development of high voltage, high current and the miniaturized pulse power technology applications. In the vacuum environment of PTS, the insulation performance is greatly affected when soft X-rays radiate the insulating material. Therefore, in order to improve the insulation properties of cross-linked polystyrene material in PTS and obtain a deeper understanding of surface flashover mechanism, the radiation effects of soft X-rays on cross-linked polystyrene were studied, influence of different irradiation times on the surface flashover performance was observed. The experimental results show that the surface flashover performance of samples without irradiation is better than the soft X-ray irradiated samples in vacuum, and the surface flashover performance of 14 times irradiated samples is a little better than 2 times irradiated samples in vacuum. At the same time, the mechanism of the soft X-ray radiating insulator surface is used to explain the experimental results very well.