The Dutch invented the most primitive capacitors in 1745, capacitors are regarded as the basic components of electronic circuits, widely used in various fields. With the development of the electronic components and the popularity of home appliances, the capacitor industry in China havs unprecedented development. Now, the capacitor is the most widely used in China.China has gradually become one of the world's largest producers of the capacitor.Because the big earthquake in March In japan,many factories of alumina electrolytic capacitors have been affected,thus,it leads that many orders of capacitors have been flowing into China which give many opportunities for Chinese capacitor industry.It is forecasted by China Electronic Components Industry Association Information Center China's aluminum electrolytic capacitor market will maintain a 5% -9% growth rate from 2010 to 2012,but as the "energy saving" idea is growing in popularity and frequency technology has been more widely used in the national economy field,there is a big demand for aluminum electrolytic capacitors,which will bring development of capacitors.