The equations for pollutants load estimation from paddy developed by the Ministry of Environment in 1995 were tested with the data (T-N, T-P, CODMn, and SS) collected from Youngsan and Sumjin river watershed, and improvement measures were suggested. Overall, the simulated values showed differences from the measured values except for T-P according to the statistical analyses (RMSE, root mean square error; RMAE, root mean absolute error; RB, relative bias; EI, efficiency index). Such difference was assumed due to the fact that the equations use hydrologic factors (associated with precipitation and run-off) but do not include water quality factor as variables. In addition, in terms of accessibility of the equations, some variables in the equations such as run-off depth and run-off amount which can not be obtained from the exist database but obtained by real measurements need to be replaced with other variables.