Since alpine upland in Pyungchang-gun has been typically applied every two or three years with saprolite, agricultural by-products are inputted to raise soil properties. Therefore, the effect of saprolite application on water quality in runoff and leachate should be monitored. To investigate water quality in runoff and leachate with various treatments of agricultural by-product, lysimeter with dimension of 0.85m x 1.75m x 0.30m was installed in Kangwon National University. Control, mixed compost with cow, chicken and sawdust by-product(CCSC), chicken manure by-product compost(CC), food waste by-product compost(FWC), and beer sewage sludge by-product compost(BSSC) at the rate of 10 ton ha-1 were mixed with soil in 25cm depth, and water qualities in runoff and leachate were monitored from Jun 4, 2004 to Oct. 18, 2004. EC(805-2,200 ìS/cm), T-N(25-75 mg/L), T-P(0.12-0.43 mg/L) values in CC treatment were highest in both runoff and leachate. EC values in CC and FWC treatments continuously increased during lysimeter experiment, while T-N and T-P values continuously decreased. Averaged T-N concentrations in runoff taken from CCSC, FWC and BSSC treatments were 41, 34 and 37 mg/L, and leachate were 35, 28 and 34 mg/L, respectively. Averaged T-P values were not different with different treatments. EC values in leachate were higher than runoff, and T-N values in runoff were higher than leachate.