The guiding and coupling principles of light cone are analyzed, and the design parameters are calculated by the ray theory. Some parameters of light cone, such as a transmitting ratio and coupling efficiency were tested: the transmitting ratio is 99%, the coupling efficiency is beyond 73%, the laser-induced damage threshold energy density of front face of cone is 56 J/cm2, and the threshold of power density is 2.25 GW/cm2, output laser energy reaches 50 mJ before the light cone is damaged. Finally, it is proved that high peak power pulse laser can be coupled into fibers through light cone, which can increase the capacity of laser power.