To stop a gap in the aspect of monitoring and analysis of energy efficiency in China's offshore oil industry, this paper designs a comprehensive analysis software system that used in offshore oil platform to analyze the energy efficiency status of energy consumption equipment. The system based on C++ DL, breaks the drawbacks of tradition analysis method which is single, extensively, subjectively and others. It implements the energy efficiency monitoring, energy efficiency analyzing and energy efficiency assessment for energy consumption equipment. The software has a friendly interface. It can display the parameters of temperature, pressure, flow and power from acquisition terminal real-time. Moreover, it can draw the energy efficiency curve and generate reports according to the parameters. At present, this system has been put use in one offshore oil platform which in Bohai sea area, and taken one important step for China to build energy-efficient energy companies.