The invention introduces an LED chip which improves the light-emitting rate and a technique for preparing the LED chip. The LED chip is provided with a first semiconductor material layer in the firstconducting type, an active luminescent layer, a second semiconductor material layer with the second conducting type, and an LED chip which is formed from a first and a second electrodes and is arranged on the first and the second semiconductor material layers, wherein the second electrode is composed of a transparent electrode and a first thickening electrode which is positioned in part of the transparent electrode, and the first electrode is positioned on the nongeometric edge of the LED chip and is encircled by the transparent electrode.