This study investigates how particular configurations of conditions successfully resulted in peace building for 22 post-conflict countries during the period of 1965-1997. In particular, the paper focuses on whether democratic accountability, GDP per capita, intervention of UN PKO, and quality of government are important conditions that are associated with the successful peace building two to five years after the civil war, for post-conflict countries. Using the crisp-set analysis, this paper examines how the combination of these four conditions contributed to the successful peace building. The results suggests that a high quality government with the absence of UN PKO’s intervention two years after the war, and a high quality of government in combination with both high level of democratic accountability and high level of GDP per capita five years after the war, both attribute to the successful peace building. This paper highlights not only the importance of a good quality government but its configuration to the other three conditions that allows for successful peace building.