In this paper, the absorption spectra and mechanical strength of Ce-doped silica glasses with different concentrations are studied. Several kinds of Ce-doped silica glass tubes with different impurity (such as CeO2, Al2O3, TiO2) are made, and high-power xenon flashlamp are made by these tubes with same procedures. The spectral, mechanical strength and thermal properties of the Ce-doped silica glass tubes are measured and the explosion energy of xenon flashlamps are also tested. By comparative experiments it is found that silica glass doped with proper amounts of CeO2 can strongly absorb ultraviolet radiation of xenon plasma at 320 nm and improve the radiation spectra of xenon flashlamps. But because dopping CeO2 in silica glass reduces mechanical strength of silica glass tubes, the explosion energy of xenon flashlamps made of Ce-doped silica glass tubes is lower than that of silica glass tubes xenon flashlamp, and the life time of flashlamp is decreased. So it is necessary to develop new materials which can not only absorb ultraviolet radiation of xenon plasma at 320 nm but also have excellent mechanical strength.