At the “Xingguang II” facility under the condition of single-beam laser slanting incidence into a half-cavity target, the energy injection efficiencies for the half-cavity target and the hole target have been measured through a new experimental method. Closure velocities of injection hole under the condition of laser slanting incidence have been estimated. The experimental results show that under the same conditions the laser energy injection efficiencies for half-cavity targets are 10 percent lower than those for hole targets.