China National Petroleum Corporation (CNPC) was established on September 17, 1988 on the basis of the Ministry of Petroleum Industry, mainly in charge of oil and gas upstream operations. It is a state-owned oil company endowed with certain governmental administrative functions, and trans-regianal, trans-inustry, multinational comprehensive oil company with modern corporate system, covering upstream and downstream, civil and foreign trade, manufacturing and sale.

As China's largest oil and gas producer and supplier, CNPC is dedicated in petroleum exploration & production, natural gas & pipelines, refining & marketing, oilfield services, engineering construction, petroleum equipment manufacturing and oil trade, holds leading position in China oil and gas production, refinery and maket. CNPC is ranked the 25th in Fortune Global 500 and the 5th among global top 50 oil companies released by Petroleum Intelligence Weekly.

PetroChina Company Limited (PetroChina) , the largest oil and gas producer and seller in China, holding the leading position in China oil industry and one of the largest of oil sales in China, was established under the Company Law and the Special Regulations on the Overseas Offering and Listing of Shares by Joint Stock Limited Companies on November 5, 1999. The American Depositary Shares (ADS) and H shares of PetroChina were listed on the New York Stock Exchange on April 6, 2000 (stock code: PTR) and the Stock Exchange of Hong Kong Limited on April 7, 2000 (stock code: 857) respectively. It was listed on Shanghai Stock Exchange on November 5, 2007 (stock code: 601857). From then on, By perfect corporate governance and strong profitability, PetroChina won the universal acceptance of global capital market.