Today, with the increasing competition, enterprises are working to increase the product quality in order to meet the demands of the customers and increase the market share. The Six Sigma philosophy that emerged in the 1970s is a study to reduce the costs of poor quality in the production and service process. In this study, Six Sigma philosophy was applied in order to reduce the cycle time of the diamond sofa product produced by a furniture enterprise. Firstly, the production line was examined in detail by SIPOC analysis method and the cycle times of the processes were collected by chronometry method. Then, statistical methods such as project identification document, Pareto diagram, Fishbone diagram were used. The control of the change in cycle time in the production of diamond sofa was calculated by ARENA 9.0 simulation program.