This study is a critical analysis on the 10 Years (2002-2012) of the denominational activities since the 5 Districts were merged into one national district of the Church of the Nazarene in Korea. The purpose of this study is to search for an advanced way to promote Church of the Nazarene for effective church growth in the coming era in Korea. For this purpose it attempts to evaluate the efforts and results of the unification of the five districts into one in relation to history and church growth of the denomination. Indeed, the merging of the five districts into one was a historical event in the mist of divisions and conflicts of the churches and denominations in Korea. Also the merging event was a distinctive model for innovative cultural adaptation from the perspective of international Church of the Nazarene. This essay discovered some positive results from the unification, that enhanced the identity of the Nazarene Church, administrative consolidation for ordination process, church planting, and unified relations with the international church as well as Korea Nazarene University. However, still the unified church needs an innovative dimension of leadership system for effective church growth. This essay proposes that the pyramid model of the unified church needs to be transformed into an organic or post-hierarchical system. Already, the name of “International Headquarter of the Church of the Nazarene” was changed to “Global Ministry Center” to abolish the existing pyramid model of leadership toward organic model, which is the fundamental Biblical model of leadership for effective church growth. This essay insists that Nazarene Church in Korea also needs to work on having a less hierarchical system of the Church for effective church growth, that is one of the main movements of postmodern evangelical churches,