In the compressed air system daily operation , energy management is not easy. It is not only related to the equipment itself, but also the maintenance level, the operator, the air demand change, even the environmental conditions. Systematic energy saving asks for very professional comprehensive competence . Guibu has developed an IOT based energy efficiency management system and efficiency analysis tools to support the energy saving project for the whole compressed air system. The real time analysis is based on “cloud” for the fluctuation and change of energy efficiency in a long-term period, then it will find out the improvement potential, and then make energy saving improvement proposal and achievable target for productivity and cost optimization.