KSLA published our first version of treatment guidelines for dyslipidemia in 1996, which was based on health examination data gathered by the National Health Insurance Corperation in 1994. A number of academic societies including the Korean Endocrine Society, the Korean Society of Cardiology, the Korean Society for Laboratory Medicine, the Korean Society for Biochemistry and the Korean Nutrition Society participated in the development of this guideline. In 2003, the second version of our guidelines was published based on the Korean National Health and Nutrition Survey (KNHANES) data which was collected in 1998. In 2006, the second version was modified and expanded with using KNHANES data collected in 2005. This article summarizes the recommendations included in the expanded second version of treatment guidelines. The full version of treatment guidelines in Korean is available at the KSLA Homepage (http://www.lipid.or.kr).