Abstract: According to the requirements of PetroChina Exploration and Production Branch, Southwest Oil & Gasfield Company carried out energy efficiency benchmarking for gas purification business. The method of "subdivision unit, and ratings contrast" was used to basically overcome the differences between purification devices, and eliminate the impact level of non-comparable factors, which provides a feasible idea for energy efficiency benchmarking of oil and gas field upstream business. The technology difficulties and solution ideas of energy efficiency benchmarking in gas purification business were summarized.