This paper put its purpose on the critical review to the relation of theology and rituals of ‘The Presbyterian Church in the Republic of Korea’(PROK) as a protestant denomination in Korea. PROK was established in 1953 as a new denomination of Presbyterian Church with ‘Missio Dei’ theology. That had meant PROK made clear its identity as a church of the participation in the social and political affairs. In 1980s, PROK renewed its theology into ‘the theology of justice, peace and integration of creation’. There was some widen concerns about nature and international relations including North Korea. In the time of 50thanniversary, PROK promoted new theology in the spirit of Holy Year of Jubilee, which is ‘the theology of grace, life and service.’ The history of PROK was realization process of its theologies in churches and societies. And a lot of rituals of PROK were reflections of its theologies. I have researched the change, renewal and invention of the rituals in the official books of common worship of PROK with critical perspectives, and found some characteristics of PROK as a protestant denomination in Korea:Firstly, it is the spirit of freedom that PROK could change and realize its theology with rituals. So PROK is known most liberal denomination in Korea. Secondly, PROK is a progressive denomination in a sense of its invention of ritual such as the memorial worship of democratization, ceremonies for divorced persons, and etc. Thirdly, PROK shows its characteristic in adapting the traditional rituals of Korean culture. Several churches of PROK used to apply the terms, musical tools, and structure of Korean folk rituals in Sunday main worship. Lastly, though PROK changed its theology two times, ‘Missio Dei’ theology plays an important role its activities in social and political affairs. It remains as the symbol of PROK.