During the period of Eleventh Five-year Plan，the city of Beijing will be facing a stableand faster economic and social development. According to the newly approved Outline forEleventh Five-year Plan on National Economy and Social Development of Beijing, theannual growth rate of the GDP of Beijing will be kept at 9% in the period of EleventhFive-year Plan. In 2010, the per-capita GDP will be doubled than that of the year 2000.Meanwhile，the hosting of 2008 Olympic Games will bring about a key opportunity for thedevelopment of every walk of life in Beijing on the one hand and higher standarddevelopment is also needed on the other hand. As one of the industries involving theinfrastructure，the electric power sectors shall, in advance, carry out the in-depth researchand work out the plan for power grid development so as to implement all kinds ofmeasures to guarantee power supply for the 2008 Olympic Games.On the basis of analysis on the previous research method of the power grid planningover the past years，the article, with consideration of the nature of terminal network in ametropolis, focuses on planning rules for guaranteeing power grid safety, stableness andreliability. It includes the research on 500kV system introduction to downtown city,
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