A high power flip chip LED has an n-doped semiconductor layer formed on the sapphire substrate, with a plurality of first regions and a second region of intersecting lines for separating the first regions from each other. P-doped semiconductor layers are on the first regions of the n-doped semiconductor layer to form mesa structures. At least one pair of diagonal corners of the respective mesa structures are rounded inward to form first basins between adjacent inward-rounded corners. First metal layers are on the mesa structures in a same configuration. A second metal layer is on the second region of the n-doped semiconductor layer. First ohmic contacts are on the first metal layers. Second ohmic contacts are on the second metal layer in the first basins. The LED can prevent the current channeling to increase the luminous area while equalizing the current density area thereby generating high brightness light.