Abstract: PetroChina Oil & Gas Pipeline Control Center of Beijing established assessment system of operation level based on the demands of performance assessment status for pipeline industry and itself business development. The system covered five index systems as follows: (1) key contrast index system, consisted of two levels in the general status of Control Center and management level; (2) overall assessment index system, consisted of seven levels in the general status, communication system, SCADA system, technique management, security & emergency management, gas dispatching operation & management, and liquid dispatching operation & management; (3) pipeline contrast index system, consisted of four levels in communication system, SCADA system, technique management, and operation performance of production & dispatch; (4) dispatcher contrast index system, consisted of three levels in basic cognitive ability, energy consumed, and control performance and (5) the complexity, consisted of two levels in natural features of pipeline systems and influencing factors in pipeline control operation; the pipeline complexity factor was introduced to describe the complexity of influencing factors in pipeline control operation. The mechanism of assessment system in the quantitative index combined with the qualitative index as assessment index made the quantitative index more accurate and qualitative index more advanced. It is considered that this assessment system not only can be utilized in lateral comparison to the competitors and quantifying itself advancement in this industry, but also in longitudinal analysis to itself operation and quantifying the progress speed and achievement.