The shock timing experiment in ablator material wave, where the shock wave transferring and catching up are investigated, can be simulated with an inertial confinement fusion planar target. The photo ionization effect caused by the X-ray from Hohlraum target is explained. With the simulation data, the block effects of Au and Cu for shock wave are analyzed. The shock velocity and the transfer time of two-shock wave in CH material are compared by using two radiation sources. The shock signals of acceleration and deceleration are obtained after adding Au block layer with thickness 5 μm to the Al layer. The shock signals of acceleration, deceleration and reloading for two shock wave experiment are achieved after adding Au layer with thickness 2 μm and Cu layer with thickness 3 μm. The experimental data show that the two conditions should be satisfied in order to obtain the two shock signals. The first condition is that the difference in radiation between two steps source should be large, and the second condition is that the shield layer should be the combination of high impedance Au and low impedance Cu. These experimental results show the shock timing ability of "Shenguang-Ⅲ", and give the reference design for planar target in shock timing technique.