This study was conducted to examine the effects of trampling on the changes in soil and vegetation around the trails. The study areas were established both on the trails and in the forested areas located in Ui and Jeongnung valleys at the Pukhansan National Park. Soil core sampling, measurements of vegetations and counts of persons visited per hour were done. The results obtained in this study were as follows: 1. Bulk density and penetration resistance, in general, decreased with increasing altitudes. Decrease in soil compaction resulted in increased porosity and water content. However, there were no regular patterns in vegetational changes as the altitude increased. 2. The physical properties of soils became better with increasing distances from the trail, and the best conditions were observed in the forested areas. 3. More number of individuals and basal area (or coverage) in woody plants were observed in the forested areas than at trailsides. For the herb layer, however, more number of individuals and coverage were shown at the trailside. 4. The percentage of monocots was greater in the forested areas than at trailsides. 5. In the Vi valley, the quantitative measures of herbaceous plants decreased as the bulk density and penetration resistance increased. In the Jeongnung valley, however, only bulk density was negatively related to the quant native measures. The fact that there were poor relations between soil factors and quantitative measures of herbaceous plants in leongnung valley might be influenced by other factors rather than soil compaction. Thus, more research would be needed to underand the critical factors affecting the vegetational changes in recreation areas.