Introduction.- Basic concept of light-emitting diodes.- Property and testing analysis of III-nitrides based light-emitting diodes.- Epitaxy growth of III-nitrides based light-emitting diodes.- Green and blue light-emitting diodes based on InGaN/GaN MQWs structure.- UV light-emitting diodes based on AlGaN MQWs structure.- Quantum efficiency promotion of III-nitrides based light-emitting diodes.- Chip process of III-nitrides based light-emitting diodes.- Packaging of III-nitrides based light-emitting diodes.- Reliability analysis of III-nitrides based light-emitting diodes.- Application of light-emitting diodes.- Novel technology of III-nitrides based light-emitting diodes.