EXHIBIT 8.1 MAJOR SUBSIDIARIES OF PETROCHINA COMPANY LIMITED I. WHOLLY-OWNED SUBSIDIARIES 1. Daqing Oilfield Limited Company II. CONTROLLED SUBSIDIARIES 1. Liaohe Jinma Oilfield Company Limited (99.49% owned by us) 2. Daqing Yu Shu Lin Oilfield Company Limited (88.16% owned by us) 3. Jilin Chemical Industrial Company Limited (99.61% owned by us) 4. Jinzhou Petrochemical Limited Company (98.92% owned by us) 5. CNPC Exploration and Development Company Limited (50% owned by us) 1