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This study was initiated to examine the feasibility of controlling soil erosion by applying PAM (polyacrylamide) to steep alpine fields in Kangwon Province, Korea. The effects of PAM soil amendments on runoff and sediment yield on Chinese cabbage runoff plots were studied under simulated rainfall conditions. Six runoff plots of 24 m were built and 3 PAM treatments of 40 kg PAM/ha, 20 kg PAM/ha and 0 kg-PAM/ha (control) were applied. Three rainfall simulations that were composed of 30-min dry run, 30-min break and 30-min wet run were performed. Rainfall intensity was about 70-85 mm/hr. The effects of PAM on runoff and sediment loss reductions were readily apparent during the second simulation. Runoff and sediment reductions (40 kg-PAM/ha) for the dry and wet runs of the second simulation were 95.0% and 48.8%, and 99.6% and 97.0%, respectively, compared to those of the control. However, the reductions observed during the third simulation (after the harvest of the cabbage) were significantly less dramatic because of soil surface disturbances during harvest works. Studies on the long-term effect of the PAM application on alpine soil properties in field-scale runoff plots were suggested.