It is of great importance for oilfield companies to improve business performance and fulfill the cost-effective objective under the background that international oil prices continue to remain at a low level. Based on the DEA model and Malmquist index, this article makes static and dynamic evaluations on business performance of 24 typical Chinese listed oilfield service companies between 2011 and 2015. It points out that China's oilfield service industry is not perfect enough in business management and syste...