Implementation of Six Sigma Method to Maintain The Quality of Construction Projects. Six sigma (6-sigma) is amethod that widely developed in the world, especially in manufacturing industry to decrease failures in achieving goodquality in construction projects. The objective of this research is to explore the existing condition of qualitymanagement and the aplication of 6-sigma method in maintaining quality of construction projects. Structured interviewsto experienced experts and people who were recommended by their companies were conducted. Non-parametricanalysis using frequencies distribution procedures were used for analysis. The result shows that existing condition inquality management of construction project in Indonesia have been implemented 6-sigma method approach, thatconcern with is how to adapt with either from internal or external condition of that project.