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This paper aims to comparatively analyze the carbon reduction potential of several low carbon technologies by means of different assessment and planning methods for regional development. Seven commonly used building energy saving technologies are evaluated and the priority-setting among them is identified on the example of the building sector in Chongming Island, Shanghai. By applying Decoupling Theory, the CO 2 emission reduction extent under a low carbon scenario and an ideal scenario are estimated for 2030. The required application areas for different technology schemes are calculated using the Technology Combination Planning Method. In order to further find out required application areas for each technology under the least costs, the Goal Programming Method is then applied. Findings of the Technology Combination Planning Method reveal that the combination of energy saving technologies with high GHG emission reduction such as building insulation and geothermal heat pump have obvious effect in helping reducing the required technology application area. Goal Programming provides results for the required application area of each technology, and the minimum emission reduction cost is found as 2.54 × 10 8 US dollar under low carbon scenario and 3.50 × 10 8 US dollar under ideal scenario. [ABSTRACT FROM AUTHOR]