The research focuses on the applications of local good governance (LGG) in decentralized commune development planning in Cambodia. The main objectives are to study the institutional framework and mechanism of LGG application in CDPs; to examine the applications of LGG in the implementation of CDPs; to gain the perception and satisfaction of CCs members and local people on the application of LGGs in the CDPs; to analyze facilitating and constraining factors in the application of LGG in CDPs and to suggest recommendations to strengthen LGG performance for effective implementation of the CDPs and provide planning and policy implications. Research concluded that commune with higher achievements on the applications of LGG in CDPs is the one that had relatively longer experience in working and accumulating learning process in adjustments of LGG in the CDP and also capacity of the CCs on local planning. A set of recommendations were given to strengthen the LGG in specific development stages of CDPs as well as outlining key planning and policy implications to support the overall implementation to make it more effective in the context of Cambodia.