利用转镜式高速摄影机分幅摄影技术，对脉冲氙灯放电中的沟道扩展和熄灭过程进行了摄影和分析.放电时沟道扩展速度很快，呈树枝状，沟道熄灭过程长于扩展过程，且呈斑状.同时研究了预电离放电对沟道扩展和熄灭过程的影响，当预电离存在时，脉冲氙灯放电的沟道扩展的时间要长.结果表明，预电离有利于放电沟道的形成，提高氙灯的发光效率，且有助于减小主放电能量对管壁材料的冲击.

High speed framing photography was used in the process of flashlamp discharge.The research displayed that the channel expanded fast and inhomogeneous,and the duration of extinction was longer than that of expansion.The discharge processes with pre-ionization and without pre-ionization were compared.The results show that pre-ionization is favorable to channel expansion,and helps to reduce the damage to the tube and enhance the radiation efficiency of xenon lamp.