Future electric cars (plug-in electric vehicle, PEV) large-scale access, will bring to power system planning and operation can not be ignored. This article first introduces the research status of electric vehicles, including its development scale, technical characteristics and power supply mode, and points out that due to regional differences between the consideration of different factors. Then brainstorm the electric car a lot on the market after use, starting from the power generation side and distribution side, which will bring both the improvements and new problems. Power quality problem f...