A project to study the key scientific issues involving energy efficiency, a part of the National 973 Program, passed a recent verification check. To address the key scientific issues in energy efficiency, researchers focus their study on two issues: an enhanced and controllable transmission process (element energy efficiency), and the integration and optimization of energy utilization (systematic energy efficiency), and achieved the following major results: proposed a coordinated field theory (rules) for enhanced heat flow exchanges, and verified its broad validity using numerical modeling and experiments; developed proprietary new enhancement technologies and corresponding heat exchange units, including the one that have resulted in noticeable economic benefits: cross compact oval pipe, compact pipe for flow expanding, new technology for coordinated field arrangement, wing shaped heat ventilating pipe with outlets scarce in front and dense in rear, and controllable suspension arm pipe array; established a framework for energy utilization modeling, and produced new methods and the associated software for optimizing industrial process energy. The methods and software have been used at some petrochemical enterprises; established compound energy modeling for structures and the associated optimization, and made them part of the demonstration buildings using solar energy and integration technology; and worked out new technologies to improve absorption refrigeration driven by low temperature heat source, in a move to find solution for low end applications.