Environmentally sound soil management technology development is essential for sustainable agriculture in alpine sloped farmland. This farmland is located on the slopes of the mountainous region, the soils are susceptible to erosion, and are subject to intensive land use with high inputs of fertilizers and agrichemicals that might have an environmental impact. Proper methods to reduce soil erosion and to raise soil quality are necessary. This research focused on the impact of conservation tillage systems on reducing soil loss. Several experiments, such as evaluating the amount of soil loss, and monitoring water quality and loss of soil nutrients by runoff, were conducted with a lysimeter to establish the best soil management practice for the highland region from 2002 to 2004. The lysimeter was 5 m width x 20 m length and was installed in the experimental field of National Institute of Highland Agriculture (NIHA, South Korea). The soil type in the lysimeter was a silty clay loam, and the slope was 17%. The amount of the soil loss from contour cultivation decreased compared with that of a plowed-bare soil, and the ryegrass strip cultivation reduced soil loss to below the 11 Mg ha^-1 yr^-1 OECD permitted limit. Ryegrass strip cultivation was the most effective method for reducing the amount of soil and nutrient loss among various conservation tillage systems.