When the shock wave is diagnosed under indirect drive, the ionization effect caused by the X-ray in the Al2O3 and quartz has been explained with semiconductor model. And the model explanation has been confirmed by the experimental data. In the experimental data, the signal modulation in quartz on time scale has been confirmed with photo-carrier model. It is found that there is not clear “blank” effect in the quartz even if the radiation temperature is 180 eV with 60 μm ablation. The “blank” effect can be avoided obviously after the Au is used as the blocking layer. And this method provides the diagnosis way for shock wave under indirect drive.