Characteristics loading of pollutants at experimental paddy plots were investigated by a series of short time during irrigation season of 2006. In generally the concentrations of TN in ponded water after tillering and panicle fertilization were much higher than the other period during later irrigation season likely due to fertilization and low uptake by young rice crops and it straightly decreased day by day. But the concentrations of TP and COD increased three days after tillering fertilization. In the other hand the change of the loading in ponded water of TN and TP after tillering fertilization were show the same that during the first three days it straightly decreased but at the forth day increased. The other side the loading of COD in ponded is increased in the first three days but decreased at the forth day.