In order to explore the characteristics of nitrogen and phosphorus runoff loss from paddy fields,the paper studied the rule of dynamic changes of TN and TP in surface water of paddy fields after fertilization and runoff loss from paddy fields by filed experiments conducted in Liyang and Yixing of Taihu region.The results showed that the concentration of TN in surface water both reached its maximum value at the first day after fertilization in the two field experiment sites,and then decreased rapidly.It desc...