The 4th Int'l Conference on Petrochemical, Energy Conservation and Emissions Reduction (PECER 2020) will be held from December 5-7, 2020 in Sanya, China. This Conference will cover issues on Petroleum and Petrochemical Engineering, Geomechanics and Rock Physics, Energy Conservation and Emissions Reduction, Energy planning studies, Energy saving and emissions reduction in industries, etc. It dedicates to creating a stage for exchanging the latest research results and sharing the advanced research methods.