Yanchang Petroleum has a long history. In 1905, with the approval of the Qing government, the "Yanchang Petroleum Plant" was established in Yanchang County, Shaanxi Province. In 1907, the first oil well on land in China was drilled, ending the history of no oil production on land in China. Yanchang Petroleum has made important contributions to the Chinese revolution and economic construction, and is known as the "meritorious oil mine". In 1944, Comrade Mao Zedong inscribed the words "bury your head and work hard" to encourage it. Since the reform and opening up, especially after two reorganizations in 1998 and 2005, Yanchang Petroleum has entered the fast lane of sustainable development. In 2007, crude oil production exceeded 10 million tons; In 2010, the sales revenue exceeded 100 billion yuan; Entered the Fortune Global 500 in 2013; In 2021, it produced 11.3379 million tons of crude oil, processed 13.2252 million tons of crude oil, sold 6.782 billion cubic meters of natural gas, and produced 6.7661 million tons of chemicals. Its financial contribution has remained the first in Shaanxi Province and among the top local enterprises in the country for many consecutive years. It has won multiple honors such as the Third China Industry Award, the National May Day Labor Award, and the Advanced Enterprise in Fulfilling Social Responsibility in Shaanxi Province.