The front-end subsystem of energy management system（EMS） for China Southern Power Grid consists of four clustering server computers. It integrates many kinds of telecontrol and computer transmission protocols and communicates massively with the five provincial EMSs for China Southern Power Grid by TASE.2 protocol. Such key techniques as the hardware configuration of front-end subsystem， database design， software design， automatic generation and mapping of TASE.2 network name are introduced in detail.