B Based on PT. Pelita Cengkareng Paper master production historical data, the Kraft Liner 150 en' is identified as the product with highest value of defect percentage, as it is 3,62% from 4 types of products. The objective of this project is to reduce the defection rate of the Kraft Liner150 g/m2. The proposed solution is offered by using Six Sigma method's Define-Measure-Analyze-Improve-Control (DMAIC) approach, and also by implementing the Failure Mode and Effect Analysis (FMEA) method to identify the occurence of rejected products along the way of manufacturing process. Based on the results of data processing, it has been obtained that currently the company has got 3.69% of defection rate percentage, and 12313,86 value of DPMO, and 3,747 of sigma level. Some improvements are fairly proposed to fix the company's current problems. The defect-causing factors of the product are the hard-to-degrade waste paper, the soiled waste paper, and the unclean screen plate component of the ATS 21 machine. The main factors themselves have their own Risk Priority Number (RPN) each, as they are respectively 168, 144, and 108 value of RPN. The proposed improvements that given are adding some extra activities on the working instruction, especially on the raw material receiving section. The extra activities are checking the viability of the waste paper correctly and cleaning the ATS 21 machine's screen plate before starting the machining process. After the proposed improvements are implemented, the result of defection rate has been decreased by 2,49%, the DPMO has been decreased to 8293,2, and the sigma level has been increased to 3,896. Keyword : Six Sigma, DPMO, FMEA.