This paper describes the major researching achivements on Hunan power network structure

aits voltage grading and district dividing from the period of “the fifteenth planning” to the year 2010. Based on the analyses of the existing characteristics and problems of Hunan power network

the main principle for the power network strategic planning is put forward. The power network of each evolving phase from the period of “the fifteenth planning” to the year 2010 is investigated in detail in capability with and without 500/220kV electromagnetic loops. The deep and full understanding of on rationality and insufficiency of the planned power network is achieved. The main engineering projects to be urgently carried out in the network construction during the period is put forward. The conditions for realizing the voltage grading and district dividing in the network and the specific measures for its implementation are suggested at the end.