Recent years, the economy of the South Korea achieved rapid economic growth, but the labor time and the labor intensity in South Korea did not reduce at the same time. To shorten the labor time becomes one of the three most focus issues of labor relationship in South Korea recently. According to some statistics, the labor time of the South Korea is the highest among all the OECD member states. Why dose South Korea has such a serious problem of long-time labor? What is the cause? Both of these two questions are considerable. This paper starts from low-income system, special privations of labor time and comprehensive salary system to analyze the present situation and the causes of long-time labor in South Korea.