In order to explore the effects of water management from different water storage depth after fluid compound fertilizer application on nutrient loss potential of paddy field,the key technologies of “stagnant water time control” and “irrigation water management system” were used to study the loss potential of nitrogen and phosphorus from three different depth test fields which were 3(H3),6(H6)and 9 cm(H9).The results showed that:(1)The relative loss load of NO-3N for H3 increased after the first day,and reached 2.5 mg in the fifth day,while the H9 and H6 decreased with time,but H6 showed an increasing trend after the third day.However,the loss potential of NO-3N in the three storage treatments were at a relative low level;(2)The relative loss loads of NH+4N for H6,H3 and H9 reached higher level of 151.26,90.75 and 48.24 mg in the first day,respectively,then decreased to a lower level in the fifth day,the relative loss load generally was in the order of H6 >H9 >H3;(3)The relative loss loads of TP for H6 and H9 reached a higher level of 105.88 mg and 118.29 mg during the first day to the third day,respectively,then gradually decreased,but were not significant.The relative loss load of TP for H3 increased slowly and reached the peak of 50.11 mg and 50.57 mg in the first and third day,respectively,then decreased slowly and reached the lower level in the fifth day;(4)The relative loss loads of TN for H6,H9 and H3 were 521.64,372.06,293.12 mg in the first day,respectively,then rapidly decreased to the lower level in the third day,but it generally was in the order of H6 > H9 > H3.The loss potential of NO-3N was not significant after application of fluid fertilizer due to the weak nitrification;When drainage of the stagnant water occurred after the fifth day to the seventh day,the treatment H3 and H9 effectively reduced the discharge of NH+4N;When drainage occurred after the fifth day,the treatment of H3 effectively reduced the discharge of TP;When drainage occurred after the fifth day or the seventh day,the treatment of H3 and H9 effectively reduced the discharge of TN in the paddy field.Therefore,it is a clean water management mode to choose storage water's height 3 cm,and draining water after stagnant water to the fifth day in the spring ploughing paddy field in terms of fluid compound fertilizer application.