The major technologies for microelectronic discharge machining were comprehensively and systematically introduced. The major technologies include micro feeding device, forming electrode technique, micro discharge energy, new technology combined with other machining methods and micro electronic discharge machining process control. The technical features of these technologies on micro electronic discharge machining are discussed. The driving precision and the frequence responsibility of micro feeding device are high. The forming electrode technique can be used to machine the different types and the microsize of mechanical parts and ultro hard materials. The fuzzy control technique can be applied to control the electronic discharge machining process.