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A study was carried out to investigate the water balance and losses of nutrients at a paddy plot located at the southern Korea. The observed amount of precipitation, irrigation, runoff, evapotranspiration and infiltration water for the experimental paddy field during cropping period were 1,030, 566, 701, 551, and 310 mm for 1999 and 1,214, 413, 710, 682, and 234 mm for 2000 year, respectively. The measured input quantities of N and P into the paddy field during cropping period of each year were 122 to 140 kg N ha-1 and 12.64 to 13.08 kg P kg ha-1 by chemical fertilizer, 20 to 28 kg N ha-1 and 0.35 to 0.36 kg P ha-1 by precipitation, and 26 to 35 kg N ha-1 and 0.57 to 0.72 kg P ha-1 by irrigation water, respectively. The output amounts of N and P from paddy field were measured as follows. They were 48 to 52 kg N ha-1 and 1.1 to 1.6 kg P ha-1 by runoff water, and 9 to 12 kg N ha-1 and 0.04 to 0.05 kg ha-1 by infiltration water.