Research purposes: The metro power and lighting systems undertake the major task of supplying electrical energy to the various low － voltage electrical load，and they are related to many different specialized trades with complicated interfaces． Combined with the first phase project of the south extended line of the Line 1 of Chengdu metro， the research and discussion were made on the several areas related to design of power and lighting systems and the introduction was given to the setting principle and operation mode of substation，the classification of electric load and the major design principles of power and lighting devices．
Research conclusions:(1) When the length of Metro station is less than 200m，one step － down substation can meet the needs of power distribution，but for the station with narrow platform and being difficult to install the cable bridge or rack，two substations should be built．(2) When calculating the electrical load，the reasonable coefficient should be chosen for the intermittent load according to the operating mode，and some fire equipment loads should not be counted in the total computational load for the scientific choice of transformer capacity．
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