The PLA(People’ s Liberation Army) 7431 factory , （Guangdong Yunshan Battery, Guangdong Yunshan Automobile Factory ）,is a state-owned military enterprise belonging to the Equipment Department of Guangzhou Military Command .It covers an area of 200000㎡and is located in Guangzhou City ,Guangdong Province ,the forefront of china’s opening-up and reform . It is a second-rate state-own enterprise and a first-rate military enterise. The factory was established in 1970 and has a history of tens years’