Abstract: On the basis of the three-beam output of basic frequency from “Shenguang-II” laser facility and beam smoothing technology of lens-array, the shock wave with a better planarity in ranged 650~750μm the target was created after optimum design and rational combination for laser beam. Then the efficiency of output beams from “ShenguangII” laser facility had been raised. And the shock stability experiment with the inclinedplane target indicated that the shock wave steadily propagated in the Al target of thickness of about 28.38~55.82μm and 22.13~35.07μm under the power density of 3.26×1014W/cm2 and 3.11×1014W/cm2 respectively.